How about soaking her kibbles in some milk to soften it if you think she has a problem eating it but she seems to be doing ok on it, she isn't starving and fattening up, isn't she?

Isis is just being a caring kitty when she hears TL crying and just wants to check her out to make sure she is OK.. Chester is like that. He knows Amy is "different" and some days when she is really having a bad day, he follows her around doing that pur cry thing like he is telling her to be careful. When she got spayed and I brought her home, he sat guard just a few feet away from where she slept all day and kept a watch over her and even now, no matter where he is sleeping during the day, on her bad days, he will check up on her every hour or so. He tip toes up to her real quiet, sniffs her then goes back to nap until it is time to do it again. There are just some cats that are "mother hens". Sounds to me like she wants to adopt TL and mother her. I see nothing wrong with that.