POA for title in TX

Hi, I have a complicated issue, or it seems like it is to me. I recently moved to TX and I’m trying to sell my car however my car is registered in FL and the title is from PA. I need to get a POA for my mom who is the secondary owner on the title in order to sell since she is out of state.

I’m confused on what state’s POA form I need to fill out and send to my mom in PA so she can sign and get notarized and so I can sell the car without her being present at the sale. I can’t just register my car in TX due to it not passing the emissions test.

If anyone has any advice I’d love to hear it Thank you!