@Fernando267 does she stay in your listing that has moderate cancellation policy or the one with flexible cancellation policy?
You can read more about the cancellation policy here > https://www.airbnb.com/home/cancellation_policies#moderate
If she stays at the one with moderate, she will get 50% of the remaining nights.
If she stays at the one with flexible, she will get 100% of the remaining nights.
Either way, you need to communicate to her that if she wants to cancel and want a refund, she will need to cancel it from her end using the airbnb system. Please make sure that you do not cancel on your own/from your side or accept any cancellation. There are list of penalties that host can get by cancelling a reservation, so make sure that you are not doing that.
More information regarding guest cancellation > https://www.airbnb.com/help/article/43/what-happens-if-my-guest-cancels