You said..."we have been told to keep up with using a calcium supplement every other day as altough she has been given all clear (as far as we know) she still needs it and will continue to do so"...D3, vitamin A, calcium and phosphorous play important parts in bone health and they need to be in balance.
Exposure to UVB allows the chameleon to produce D3 which allows it to use the calcium in its diet. I dust with a phos.-free calcium/D3 powder twice a month to ensure that they get enough. D3 from supplements can build up in the system, so its important not to overdo it.
Insects used as feeders usually have a poor ratio of calcium to phosphorous so dusting at most feedings with a phos.-free calcium powder helps to make up for this.
I also dust with a vitamin powder that contains a beta carotene source of vitamin A twice a month. Beta carotene won't build up in the system like preformed will. Excess preformed vitamin A can prevent the D3 from doing its job and lead to MBD. Some people give a little preformed vitamin A once in a while because its not proven as to whether chameleons can convert the beta carotene.
Temperature plays a part in digestion so it plays a part in nutrient absorption too.
You said..."The woman we spoke to did mention that they didn't feed her fruit or veg, which we thought you should? So appears to have lived of medium crickets and wax worms"...(waxworms are fattening and should only be used as a treat)..crickets, superworms, silkworms, roaches, etc. can be used. There is no problem raising them on insects alone, but they do eat greens (dandelion, collards, kale, endive, escarole, mustard greens, etc.), veggies (carrots, sweet potatoes, sweet red peppers, squash, zucchini, etc.) and a bit of fruit (apple, pear, melon, berries, etc.). The greens and veggies are also a good gutload/diet for the crickets, superworms and roaches.
Here are some sites that you might like to look at...
http://www.adcham.com/
http://www.chameleonnews.com/
http://web.archive.org/web/20060502...rnals.com/vet/index.php?show=5.Vitamin.A.html
http://www.uvguide.co.uk/index.htm
https://www.chameleonforums.com/supplementation-mbd-1-a-2451/
http://raisingkittytheveiledchameleon.blogspot.com/