You've asked two questions here:
Do females eat while breeding
and
Do females eat while gravid.
I feed females while they are breeding (not while the male is in, but I figure you've got some common sense). Every extra food item that a breeding female eats will go alost exclusively towards egg weight.
The females will eat ravenously while breeding IF fed.
All the females I have bred over the years refuse food at a certain point, usually when they become gravid.