Welcome to the forum!
I can see that you care very much about your chameleon.
Sorry your cham is having troubles but at least you have now found a forum where you can get reliable cham info.
Some people here have many years of experience with chams and others are just getting started--so it's a somewhat diverse group.
Too often, people get incorrect info from petstore employees who don't know the right care info.
It has happened to many of us, if not to most of us.
Aside from daily calcium without D3 and misting more often, I do see another thing in her care that should be changed to help get her back to good health.
Her basking temperature is too cold.
It should be closer to 85 degrees for a young Veiled chameleon.
MBD can be caused by too low basking temperatures, a lack of uvb, as well as improper supplementing or the lack of a nutritious, varied diet.
You don't want to give her the Reptivite multivitamins more than 2x a month.
Chams need certain amounts of both D3 and the other vitamins and too much is as bad as too little is.
Calcium without any D3 or phosphorus, like this one http://lllreptile.com/store/catalog...um-and-vitamins/-/rep-cal-calcium-without-d3/
can be used to dust each feeding.
Feeding a variety of insects, which are themselves well fed, will help to ensure a balanced, nutritious diet for your cham.
Slikworms, Dubias, Hornworms, Phoenixworms, blue bottle flies and superworms can all be added to her diet.
Silkworms, hornworms and Phoenixworms are typically higher in calcium than the other feeders are.
Phoenixworms are said to be the highest in calcium.
Here is a wonderful writeup by a veterinarian, about MBD with some very valuable info, including how you can help your cham:
https://www.chameleonforums.com/wha...ase-mbd-looks-like-how-happens-how-fix-95071/
You will read about what things you can do to help her, such as 1 drop of liquid calcium 2x a day.
Of course, treatment by a vet with a good knowledge of reptile care is ideal.
This Veiled caresheet was written by the forum moderators and has reliable care info for your Veiled:
https://www.chameleonforums.com/care/caresheets/veiled/
You probably were not told that the UVB bulb will need to be replaced every 6 months because the bulb will still light up just fine--but it won't be emitting enough UVB for youe cham after about 6 months of use.