Is she still sitting low in the cage? Does she keep her eyes open or shut?
Weak grip isn't good.
Has the vet ever seen eggs in a veiled that are ready to lay?? They don't usually look well-calcified even at that point. Are the eggs oval or round in the x-ray?
When you are giving her the calcium make sure that you just ease it into the mouth...don't squirt it or it might go into her lungs. Same with the water. If she is still drinking, get her drinking by dripping water on the tip of her nose and while she is opening her mouth ease the calcium in....it will be less stressful than pulling her mouth open and you won't be so likely to hurt her either.
You can try digging a hole for her in the sand in the new egglaying container you are putting in for her. Sometimes it gets them going. Because you didn't have the container in sooner, it may be playing a part in her problems.
You also should make the needed changes to the supplementing and gutloading. Also 50 crickets a week is too much IMHO for a female veiled. Over feeding constantly can lead to reproductive issues, constipation, prolapses and even MBD. I'm hoping she isn't already in trouble, but I think she might be.

I hope she lays the eggs for you, but the problem is that if you wait and she doesn't it might be too late for the oxytocin to help her and the only option will be spaying as long as she doesn't get too weak to do it. ;(
You don't need a light on at night and you don't need any source of heat unless the temperature drops into the low 60'sF. If it does get that cold, then you can use a heat emitting "bulb".
Is the cage in the sun at all during the day? Close enough to the window to feel the cold air from it at night?
Here's some information I hope will help you with things like supplements, gutloading, etc....
Appropriate cage temperatures aid in digestion and thus play a part indirectly in nutrient absorption.
Exposure to UVB from either direct sunlight or a proper UVB light allows the chameleon to produce D3 so that it can use the calcium in its system to make/keep the bones strong and be used in other systems in the chameleon as well. The UVB should not pass through glass or plastic no matter whether its from the sun or the UVB light. The most often recommended UVB light is the long linear fluorescent Repti-sun 5.0 tube light. Some of the compacts, spirals and tube lights have caused health issues, but so far there have been no bad reports against this one.
A wide variety of insects that have been well fed and gutloaded should be fed to it.
Since many of the feeder insects we use in captivity have a poor ratio of calcium to phosphorus in them, its important to dust the insects just before you feed them to the chameleon at most feedings with a phos.-free calcium powder to help make up for it. (I use Rep-cal phosphorus-free calcium).
If you also dust twice a month with a phos.-free calcium/D3 powder it will ensure that your chameleon gets some D3 without overdoing it. It leaves the chameleon to produce the rest of what it needs through its exposure to the UVB light. D3 from supplements can build up in the system but D3 produced from exposure to UVB shouldn't as long as the chameleon can move in and out of it. (I use Rep-cal phos.-free calcium/D3).
Dusting twice a month as well with a vitamin powder that contains a beta carotene (prOformed) source of vitamin A will ensure that the chameleon gets some vitamins without the danger of overdosing the vitamin A. PrEformed sources of vitamin A can build up in the system and may prevent the D3 from doing its job and push the chameleon towards MBD. However, there is controversy as to whether all/any chameleons can convert the beta carotene and so some people give some prEformed vitamin A once in a while. (I use herptivite which has beta carotene.)
Gutloading/feeding the insects well helps to provide what the chameleon needs. I gutload crickets, roaches, locusts, superworms, etc. with an assortment of greens (dandelions, kale, collards, endive, escarole, mustard greens, etc.) and veggies (carrots, squash, sweet potato, sweet red pepper, zucchini, etc.)
Calcium, phos., D3 and vitamin A are important players in bone health and other systems in the chameleon (muscles, etc.) and they need to be in balance. When trying to balance them, you need to look at the supplements, what you feed the insects and what you feed the chameleon.
Please note that various supplements have various amounts of D3 and vitamin A and so some can be given more often than others. The idea still is not to overdo the fat soluble vitamins like D3 and prEformed vitamin A.
Here are some good sites for you to read too...
http://chameleonnews.com/07FebWheelock.html
http://web.archive.org/web/200605020...Vitamin.A.html
http://web.archive.org/web/200406080...d.Calcium.html
http://www.uvguide.co.uk/
http://web.archive.org/web/200601140...ww.adcham.com/
If you can't access the sites above that have the word "archive" in you can do it through the WayBackMachine.