Hi Jessie
I think it is really important to leave negative feedback when there is a reason, otherwise how are we , as hosts, suppose to know who to welcome to our home home. She sou ds like she hasn't understood how airbnb works, i would be Very clear about your position as host and derect her to airbnb for further requests such as invoices. As for pricing, i would tell her that if it is too much for her she can always look for a different one. If i were you i would write her a msg pointing out what you think she should understand and what it is you didnt like, then leave her a more simpler review.
Best
Flavia