Welcome to the forum!
From your husbandry and description of her and without seeing pictures it sounds like MBD.
You don't mention having a UVB light. They need exposure to UVB in order to produce D3 so they can use the calcium in their system.
You said you provide light at night....they don't need light at night.
What is the temperature in he basking area? Without appropriate temperatures they can't digest the food properly so they don't get the nutrients they need.
They also need supplements.
Since most of the feeder insects we use have a poor ratio of calcium to phos its important to dust them before feeding them to the chameleon with a phos - free calcium powder to help make up for it.
I also dust twice a month with a phos - free calcium / D3 powder to ensure that the chameleon gets some D3 without overdosing it and leaving it to produce the rest from its exposure to the UVB. D3 from supplements can build up in the system and lead to health issues so we don't want to overdo the D3 supplements.
I also use a vitamin powder that contains a beta carotene (prOformed) source of vitamin A. Vitamin A from prEformed sources can build up in the system so by using some prOformed source it leaves it so we can be in control of it.
It's also important to feed/gutload the insects well. Crickets, locusts, roaches, superworms can all be fed a wide assortment of greens such as dandelions, collards, endive, escarole, mustard greens, kale, etc. And veggies such as carrots, sweet potato, sweet red pepper, squash, zucchini, etc.
Calcium, D3, phos, and vitamin A. Are all important players in the bone health and other systems in the chameleon and need to be in balance. When trying to balance them you need to look at what you feed the chameleon and the insects and at the supplements you use.
One more thing female veileds can produce eggs without having mated and need an appropriate place to dig to show you when they are ready.
Sorry if that was not clear.
