That's a tough situation. $15 a session is fantastic. Shelter, food, and work are a priority in my eyes. Therapy can be great asset to some people but if it places you in a more stressful situation due to the finances then that becomes an issue. At least you were honest with your T and she knows that you were dumpster diving and making every effort to go to session. I would speak to her about your situation which is already known to her.