@Michelle183
Basically, your guest payed for a set of replacement keys, with no notion that your house security was compromised.
Having had my car keys lifted off a table in a restaurant over sea’s (I don’t like having them in my trouser pocket when I’m sitting down) the same could have happened to her and the thieves could have followed her to your house! Farfetched well I don’t think so.
So, changing the locks is an imperative.
Having recently replaced a lock on a storage unit in my apartment block it cost me Euros 70 to buy, two hours’ time getting it and another two hours putting on.
The sharing economy my bottom I didn’t want to say arse.
Good luck with your endeavours but don’t hold your breath on getting any more money.