Dragons know what they need so your T 5 is a good strong light --- she may not need to bask as long as she did before especially if the last UVB was not as good or strong as the one she has now- mine does not sit under his everyday either and will go days w/ out sitting under it and then he will switch and sit under it every day for like an hr or so -- she will go sit where she needs to -- your distance for the UVB is what and is it in the tank ?
Karrie