Sorry to hear about your situation.
Two things. I had a chin who had four actual stitches when her leg was amputated, and she left them alone. Whether they chew may also be dependent on the chin.
Second, if she doesn't have an appetite, you can get Oxbow Hay's Critical Care for her. It is like an alfalfa smoothy with acedopholis (to balance intestinal bacteria). I used to give antibiotic and follow with Critical Care. Oxbow only dispenses it on veternary recommendation, so your vet will need to call it in.