((((Velcro)))) I dont have any words of wisdom on mother subjects, but maybe when she comes in you could act in a way that shows her you care. It might relieve some of your worries about being an awful daughter and make your mom feel good.
I dont think you are selfish. Maybe there are reasons you dont want much contact. Its not selfish to have feelings like that toward your mom. its how you feel, you need not judge it. We can be so hard on ourselves for how we feel
And GO YOU for asking for something for yourself from your t! I hope the appt is still open for you!