Overseeing PA for free?

I’ve been working at this new job for a few months, replacing the last person who oversaw a family med PA. I’m the only one in the office seeing kids with her. I was approached by admin asking if I would oversee her, since my predecessor did. I asked if this came with compensation and she said no. I told her I’d think about it. She is competent and I trust her, but I think to myself - no pay, no work, and it was not on my contract. What would you do?