To Refund or not to refund

[Andrea Cole]

We run an Airbnb in High Point, NC. This time of the year is Furniture Market, which carries our highest daily rates of the year. We have a guest that was supposed to arrive last night from Texas but her plane got delayed due to weather so she won't be arriving until today. And, she's given indication she could be a difficult guest. Even though she hasn't asked, should we offer a partial refund? My husband thinks we shouldn't but I'm leaning towards a 50% refund as a gesture of good will. The nightly rate is $175, so we're only talking ~$88. Is this giving money away? Am I being too generous??