I'm pretty sure that was the best he could at the time. If it was possible, he probably would have evicted her sooner. It's also not like she's completely helpless or didn't know about the home being for sale, and there are plenty of cheap rooms near public transit for rent in the Bay Area.
At the end of the day, it's private property. She's not entitled to live there if the owner doesn't want her to.
At the end of the day, it's private property. She's not entitled to live there if the owner doesn't want her to.