Collecting Past Due - After the House Sells?

[Vincent Plant]

Hi, 

I owned a rental property for about 3 years. I decided it had appreciated enough and sold it off to another investor who was happy to inherit my tenant.

My tenant was always a little rocky. She scraped together the rent most months and paid late (with a fee) but was always able to make it work. 

So, we closed the other day on the 5th. Of course, I tried but she didn't give me any rent before the closing, and I prorated the rent and sec. deposit from day 5-30. 

So the new buyer is paid up for the month of December, however now I have transferred the property and was not able to collect rent for the month. 

I instructed the tenant to pay the rent this month to me still and begin paying the new owner next month. 

Wellll she's ghosting me now. She probably knows she has the upper hand and I don't have any recourse since I no longer own the property. 

Is there anything I can do?