Welcome to the forum!
IMHO...there is no need to stop using phos.-free calcium to get rid of edema IMHO. I would worry about the D3 and prEformed vitamin A. Chameleons can also develop edema when gravid that will usually go away after they lay the eggs/give birth.
Here are some sites that might help...
http://web.archive.org/web/20060502074341/www.chameleonjournals.com/vet/index.php?show=7.Edema.html
http://chamworld.blogspot.com/2008/01/health-section-f-gout_28.html
http://www.seavs.com/case_studies/lizards/chameleons.asp
Does your female have a place to lay eggs? From the amount you are feeding her and the temperature in the basking area its quite likely she will produce eggs (if she's not already producing them). Veileds don't need to mate to produce eggs. If you don't provide a proper site for her to dig to show you that she is ready to lay eggs, she could become eggbound and die. I hope she isn't past the point of laying already. Does she sit high in the cage? Has she been roaming the cage? Keeping her eyes open during the day? Drinking more than usual?
Also, do you have a UVB light on the cage?
Regarding supplements...
I dust the insects before giving them to the chameleon at most feedings with a phos.-free calcium powder to help make up for the often poor ratio of calcium to phos. found in many of the feeder insects.
I dust twice a month lightly with a phos.-free calcium/D3 powder to ensure that the chameleon gets some D3 without overdoing it and leaving it to get the rest from the UVB light.
I dust twice a month with a vitamin powder that has a beta carotene source of vitamin A. Beta carotene (prOformed vitamin A) will not build up in the system...however, there is controversy as to whether all/any chameleons can convert it....so some people give a little prEformed once in a while. Excess prEformed vitamin A may interfere with the D3 and push the chameleon towards MBD...so be very careful with it.
Calcium, phos., D3 and vitamin A are all important components in bone health and need to be in balance. You need to look at the supplements, what you feed to the chameleon and what you feed to the insects when trying to balance them.