If she is putting on weight you are probably doing okay. As far as numbers go each cat can have a different appetite so it is hard to pin down a number.
Cats generally do not overeat like dogs though they certainly love to nibble throughout the day.
I bet you are doing just fine as a slave to your cat.
I give my cat a moderate amount of dry food every evening. He know he usually doesen’t get more before the next evening so he actually seems to save food for later. Sometimes I give him wet food extra though.
Seems to work at holding his weight stable. Mine is about 4 years though. A kitten or young cat is supposed to grow so might need more then.