Is our landlord responsible for paying for the lock change?

Our apt was broken into somehow. Nothing broken. Detectives felt they had to have had a key. Nothing picked according to them. I notified our landlord. She called a locksmith. Asked for the keys to be re-locked. Locksmith said they could not be re-keyed so he replaced everything. The bill was $515. My landlord is complaining that i should have called her prior to discuss options but according to her locksmith, there were no other options. Is she responsible or are we? - Is this your question? Add additional information