My experience: A cat's intelligence is most developped when the cat likes food very much.
25 years ago I had 2 sisters Meo and Minouche. Minouche really liked food more than Meo and learned to open doors of rooms and cupboards and did many crazy things for food. One day we found her laying in a cheesecake crust. She had eaten all the cheese and made the tortellini in the crust

So Lily watch your slim line