I would teach her how to be a good tenant with a good rental agreement and swift enforcement of any violations.  

If a tenant strays, respond in a manner that is swift, firm, fair, and polite.

Not acting swiftly enough and not timing our decisions better has cost us before too.

And of course, the court will want to know what monetary damages she or her son personally incurred by her son living in my unit for 9 months, despite my allowing them to break their lease and leave owing me $_____________ in unpaid rent.The court, will also be made aware that not only was I unaware that the son was severely asthmatic, or that there was any supposed smoking going on in my rental, but that despite these facts, when the son advised me that there was smoke in the unit, on his word alone, I addressed the matter of supposed smoking in the rental with a swift and firm hand.And of course, you can explain to the judge why you are filing this type of frivolous case in his/her court.Please inform your client that should she pursue a court case, I will counter-sue for breach of contract, for all rent due on it, for filing a frivolous lawsuit, and anything else my attorney finds appropriate, and I will be asking the court to have her pay my attorney fees as well.Any further communication I receive from you will be forwarded to an attorney.Most Sincerely,YouYep, I'd probably send this letter :-)

When issues arise, they need to know you will address them swiftly, firmly and fairly.You are bound to operate off the terms of the lease that was in place when you purchased the property, which puts you at a disadvantage.

I mean Taylor Swift concert tickets in PDX are 500 a head  :)  and we know what the seat licenses for the 49ers ended up going for... !!

So, I dealt swiftly with noise problems. 

We're just their landlord and don't need to know everything going on in their life.When the rent doesn't get paid, you act swiftly to start the eviction process.

Eviction in this case could be swift and/or complicated.When you say you are "working with the owner" of this property, what exactly are you doing?

Then swiftly and safely remedy the situation.