@Dave-and-Deb0 are correct. Have your guest put in a cancellation directly with Airbnb. She will get her refund in a few business days same as a host would be paid. Having to wait until July 2016 is not true. This sounds like someone who is setting you up by requesting a refund directly from you then requesting one from Airbnb. Never engage in financial transactions with a guest. That's what Airbnb is getting the big bucks for; let them do their job.
As for communicating with this guest, refer to Airbnb then do not communicate with her any more. You need not be involved with her anymore.