Maybe you can come out with another alternative besides only require for a refund?
How about requesting her friend to bear for the repair bill? In this way, you can get to use phone, isn't this your initial intention of buying the phone? To use it right?

However, it is always fair to listen to both sides of story, we shall wait for her to appear here and listen to her side of story. It is still early to make judgment. No offence ya!