Backstory ( I am deliberately being vague as I think she's on mumsnet)
Friend came to my house and notice item,a few days later she asks to borrow item. I lend her my perfectly working item and the next day she gives it back saying she never got the change to use it. She said she should keep it for longer in order to do what she wanted to do, she insisted I take it. All was well until Sunday 2 weeks after receiving it back I went to use said item only to find that it's not working. I suspect friend broke item and gave it back in a hurry hoping I wouldn't notice ( it's not an everyday item). How do I move forward? Ask her to replace item? Or leave it?