Landlord didn't steall the keys or lose them, so the tenant pays. Check where u stand with your Landlord's Insurance if you don't address the issue immediately. Perhaps the tenant's contents policy or car insurance policy will cover goods in her car. Ask the locksmith how much for a bolt inside the back door and a new barrel on the front. Tenant should pay, but landlord should offer to expedite safety and get it done asap. Tenant can pay extra per week until paid if you like.
Cheers
crest133
Cheers
crest133