I think that sounds like a fine strategy! She always has hay available, so it’s not as though she has to come to you to eat anything, just her pellets (and salad?). The only thing is I wouldn’t force the petting all the time while she’s eating. You could use the time while she’s eating to brush her too. It would be good to just pet little bits, not to the point of making her dash away.
The other thing that can help with buns like this is to spend lots of time around them, but ignoring them. When you aren’t feeding her, play “hard to get”. That way she will learn that your presence is OK and safe. As prey animals, when buns are being watched closely it makes them feel uneasy.
She’s also only been with you a couple days, so she’s still settling in. It can take buns a while to trust new people, so she very well might have been more tolerant of touching with her previous humans. Backs in general can be touchy areas for buns.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.