Tenants gone bad - couple broke up

[Tim V.]

Sorry for the long post...

My renters just re-signed their 3rd lease with me at the beginning of March. 

March 15 the man left. When I contacted him about moving and paying rent he told me that he would not help, giving me a lot of excuses, but essentially told me to take him to court. Hes already moved into an apartment.

I contacted her and she says that she wants to stay but feels that she does not need to pay full rent because he left. She's basically trying to get me to squeeze him for money, which I told her I do not have the authority to do, and that since he has moved out the full responsibility of the rental payment is on her since she is on the lease. 

She also will not let him out of the lease either and will not move even though I offered to terminate the lease and give their security deposit back.

Today she is officially late and has been unresponsive to calls and texts since I spoke with her on March 16. Being in Travis county (Austin, TX) I think she is using the fact that they have halted evictions as a reason to not pay rent for a couple months and will then move. 

 My question is what would you guys do if you were in this situation. 

Im thinking I will start with a pay or quit letter on Monday, but with evictions halted in Texas this may not worry her at all.