I just had an idea. Since Roommate From Hell (RFH) said she was moving out, breaking the informal lease, etc., etc., then the old lease is ended.
So how about this idea (Dopers, please review & comment):
Inform RFH that since she is insisting that she is a sub-tenant, and she broke the previous informal lease, you are now putting her on a week-to-week lease. (IIRC, a month-to-month lease means that the lease lasts for one month, then automatically renews. Chop the time frame down to one week.) And the new rent is 10% over the old agreement’s weekly rate. And the rent goes up 10% per week. And then have her SIGN a contract – and include a statement that, oh, confirms your security interest in collecting payment, and in event of default she agrees in advance to a garnish of wages, a lien on any assets she might have (does she have a car?), anything else you can think of. Include a provision where she pays all expenses of collecting overdue rent, such as collection agency fees, court costs, legal bills, etc, etc.
In short, make the terms so onerous – and hopefully semi-enforcable – that she’ll scram for fear you might actually enforce some of this.
And if RFH doesn’t want to sign? Fine. Her lease is up. It’s time for her to move out or accept the new terms. Let her know in the strongest terms you can that if she is still there 24 hours later, you’ll assume she agrees to the new lease, and you’ll be collecting the week’s rent. IN CASH. No excuses.
Is this legal? Good question. Will RFH fight it? It’ll cost her.
So, people, is my idea anywhere near feasible? I’m sure it needs some rewrites.
And to pre-empt a comment: Don’t expect to see one cent more from RFH. Going back to my experience, my RFH had moved out, and was slowly paying back what he owed me. Then a big check from him bounced. I flipped out, and threatened small claims. Within a few weeks, he was on the run, never to be heard from again. (And he skipped out on the rent to that place, too! We sold off what he left behind to pay part of his defaulted rent.)