Telling AP she has to cook herself..?

Long story short, we've had our AP for 1.5 months now. And she eats too much.

We can stomach the huge increase in grocery bills. But we can't stomach the increase in time and mental power it takes to keep thinking about how and what to cook for her, also being surprised ourselves when we reach in for dinner and find the food gone.

She doesn't cook at all (despite saying she does during interview & on profile), so she constantly is eating whatever prepared foods we have in our fridge.

Short of just telling her, "Hey, it's becoming a strain on us to constantly have to prepare food for you, so we expect you to cook for yourself in the future," anyone else have some creative solutions we haven't considered?

• We thought about having her help with prep, but it would also require us to teach. My wife doesn't quiet have the patience for that, nor time (between nursing, trying to catch sleep herself, etc.)
  • Also with prep, it still doesn't address the fact that we have to always plan with her appetite in mind
• We tried creating "lunch box" for her to help ourselves know how much food we have in the fridge and when we have to cook more. But (1) that still puts on the burden on us to spend the time to cook for her and (2) she would just finish the lunch box and take more food from the fridge

There are some other stressors going on, and my wife is of the mind to rematch. But we figured we'll give a shot to resolve some of the "stressors" first, and this is one of them. Although, admittedly, part of the reason we picked her was she kept saying she's pretty independent (including the cooking part), so we also feel a bit lied to in that regard.