Fortunately the tenant left voluntarily yesterday, I was patient with him, and stayed there the whole day, putting gentle pressure.

Settled lead dust can re-enter the air when the home is vacuumed or swept, or people walk through it. "  It is recommended that you "use a HEPA vacuum and vacuum any of the paint chips and dust, bag it and securely dispose of it.

The pressure of wanting to close should be enough to get her to hire movers if she truly wants to sell.

One air conditioning repair that was a few thousand $. 

Also, check existing infrastructure including: roof, heating and air conditioning, hot water heater, flooring (sub floor), and plumbing.

The technician will have questions "Hey it's only $13.00 to install this different thermostat that improves air quality and can save $9 a month in electricity, should I use that one?".

It's not just an arbitrary number we pull out of thin air. 

Tell her her lease expired and she needs to move now and then start showing the house to perspective tenants (have a few friends pretend they are going to rent it) to add to the pressure. 

Link to current Air BNB of this property

I live in a town of about 75,000 people (Rapid City, SD) and the area just created a new air force base, which bring in over 2000 families.