In that case, she's either not hearing you or choosing not to hear you. You must enforce your policies each and every time. I know some people find that hard especially initially so it's a wise practice to get in the habit of saying "I need to think about that because it's not in line with my business and I'll get back to you in a timely manner." That gives you time to compose your thoughts and be firm when you aren't caught off guard with these requests.

Personally, I would shoot her an e-mail and let her know you have given her request some thought but in a group care environment, you must stick to a routine that works for the majority. Then ask her outright if she can accept that or if she intends seeking alternative care. It makes it really clear.

I think a lot of provider's, particularly the newer ones, are frightened of upsetting a client and losing them. But you cannot be everything to everyone and that's a fast way to burn out. Decide what your boundaries are and then enforce them. Otherwise you will feel that someone is taking advantage.

I've learned to be really direct with people and not tip-toe around the hard conversations. That way, they come away with a clear understanding of my position. I think sometimes when people are less clear, a client can come away thinking that while you might like their request, it will be honored.