I really don't think it would hurt Magic to eat the lite mixed
with regular food. I believe in free feeding cats & they always
have the dry food available (three different kinds)
The can food is 1 can shared between the 4 indoor kitties
twice a day. The 3 outdoor kitties get 1 can apiece once a day
and have the dry food available all the time. It's not unusual
for females to gain a little weight after spaying. She should
level out eventually. Goog luck with the kitties.