Otherwise, the next part may break and you'll need another repair.Also, one tip--make sure you or the tenants do not use any of the bleach or chemical tank drop ins as these cause the seals to wear out/corrode prematurely and fail or leak.Best of Luck...

Sigh, sorry if this all sounds pre-mature.

After finding the ideal tenant, prepare for a lease agreement and include all the necessary points like who will maintain the property, penalty on property damage, process of premature termination of lease, etc.

Recall the condition; they didn't want you to see it all prematurely. 

In my opinion, there should always be penalty for terminating (breaking) a lease prematurely, i.e. moving out before the lease term ends without mutual agreement.

That would be premature from what you tell us.It wouldn't matter to me if the tenant was a co-worker, family, or friend.

Furthermore, Tenant shall be responsible for reasonable advertising and redecorating expenses, lost rent, and other expenses incurred by Landlord as a result of Tenant's premature termination of this Lease.

Setting aside that it is premature at this point, ultimately if it came down to it, it may make sense to pay the debt to avoid any adverse credit consequences and then at that point sue to get it back.

In the end, we would rather have someone called pre-maturely than a potentially damaging (i.e. overflowing toilet) situation persist.

But it'd be premature to start that process now because you gave her 90 days to vacate and that time apparently hasn't expired yet.