Ask a landlord-tenant lawyer and get answers ASAP
I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear that this happened.
A landlord is never responsible for the criminal acts of a third party, whether the party is legally renting the property or not. There is unfortunately no ability to make a landlord pay when someone steals the tenant's belongings. Even if he offered to help, for him to be liable, he'd have to have specifically promised to protect her belongings (rather than offering to protect HER when she came back to get them), and he'd have to have been negligent in NOT protecting them - but a third party criminal act usually supersedes liability for any mistake someone else makes.
The tenant whose items were stolen has the ability to sue the person who took those items for the value, plus pain and suffering. And if she does not have one, she may want to seek a restraining order immediately.
I apologize that this was probably not the Answer you were hoping to receive. However, it would be unfair to you and unprofessional of me were I to provide you with anything less than truthful and honest information. I hope you understand.Good luck.