I'd like to add; I'd be willing to pay for any damages, cleaning, etc. that I caused while I was living there, but how can she discern what was from me and what was from the prior landlord (who was her mother)?
I moved into a trailer home about two years ago, and recently moved out. The landlord was a "friend" of mine and I was to live there rent free. There was no written agreement/lease/whatever.
She emailed me recently and claimed that I owed her money for the cost of cleaning the house...