Dogs, mice and turtles were very common pets in ancient Greece. Cats, however, weren't, so it's highly unlikely that Gabby ever saw a domesticated cat until she traveled to Egypt.

Okie dokie: taking this down to a single year timeline (since that's probably the best):

You've got 25 males & 25 females. Assuming that all pairs 'mate' successfully twice a year, 25 (queens) x 8 (total number of kittens for successful matings 2x) = 200 kittens in total, but then it gets complicated because I don't know when cats mate for the first time agewise...