My understanding is that HN has no shortage of libertarians. Maybe one of them could tell us if there’s an alternate way to enforce contracts.
Or does she rely on the coercive power of the State? The State that maintains a monopoly on violence.
I think threatening the tenant with a gun to get the money then kick him out of the flat is the way it should go for most libertarians. You'd appreciate the irony of this not being an aggression.
(there's a reason why libertarianism is almost only found in the US: it lays on the Far West myth a lot)