Using can and can't

Question

She can barely cook a decent meal, ____ she?

I think the answer is can’t. Please advise: what is the rule here?

Therefore, if the question is asked:

She can’t swim, ____ she?

In this case, I think the answer will be can.

What do you think?

Answer 1

1. She can barely cook a decent meal, can she?

   The emphasis is on barely.

2. She can’t swim, can she?

   The emphasis is on swim.