In court, I got a stipulated judgment for one of the tenants to leave and she was given 90 days to vacate.

It is not good to go to your court stating your lease was signed last century(20 century) and you wish to subsidize their housing thinking they can retire in there.

I've also had the opposite.I'm pretty sure no one gets into business to be drug through court.

I was told that the local entity would basically have to take you to court to try and enforce anything but that would never even be an issue as long as nobody ever complained. 

If they don't make you whole turn them over to collections or go to small claims court. 

Is this accurate or do I need to file a claim in court?

Basically it asks the court to ignore the LLC or corporate status because of wrong doing by the defendant. 

If damage deposit insufficient, small claims court for the rest.

In fact, you can read about my previous experience taking an ex-tenant to small claims court here: https://www.biggerpockets.com/forums/52/topics/252435-taking-a-tenant-to-small-claims-court-part-1Anyway, to answer your question @Matthew Wright, you can serve her at work or anywhere you can find her. 

I'd bet that these companies are actually banking on none of these ever getting to court..