As a tenant, your daughter has a reasonable expectation of habitability which includes not only an apartment in good condition, but also privacy and safety/security.
Hopefully, your daughter has documented request to fix/repair defective items/problems.
if the break-ins were due in whole or part to the building not being properly secured, i.e. the entrance door lock is chronically not working and therefore not preventing unauthorized access, the landlord can/may be held responsible for the loss/damage your daughter sustained.
if possible, your daughter should move out. also she should contact a lawyer.