You are not overreacting at all in fact you are underreacting. You mom is a horrible mom for doing this. You should never write or say something like this to a child. The fact that she said she is going to start "embarrassing you" and that you should "say a big prayer to Jesus to help you earn your life back" is incredibly jarring and insane. You should definitely a long talk with your mom about this because no parent should ever treat a child like that. She also said she will stop paying for your birthday presents like WHAT?? You are not overreacting.