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.
My male is going through his 2nd breading season and hasn't missed a meal yet. My female last year went off food around 30 days before she laid her eggs.. This year she is still eating like a champ but it isn't that far into the season for her to quit.
1.0 Bumble Bee
1.0 Cinny het Albino
0.1 Albino
0.3 Pastel
0.1 BEL (Lesser x Mojave)
0.1 Pinstripe
0.2 Normal