They should be getting most of their d3 from the UV.
If it's a fairly new bulb, at least 5%, and not too far from your cham, you
should be okay.
You want to lightly dust her feeders every day with plain calcium.
Your calcium + d3 and multivitamins should only be twice a month.
If your cham is lucky enough to be outside in the sun, you can cut back on
the d3 supplement, but not the plain calcium.