She is setting the boundries as an immature thirteen year old who is being forced into adulthood. What her psyche and emotional threshold are being tested with, I hope you will never have to experience.
For a brief moment she was a mother and now she’s been robbed of the purity of starting a family and been robbed of a living being growing inside of her.
There is nothing you can read here that will enlighten you to the point of being able to relate with your girlfriend. Be there for her as much as you can and remember to not to force anything, especially physical.
My shrink is a renowned psychologist specializing in child psychology (that’s why she sees me; a twenty-two year old) She has collegues in just about every part of the civilized world. If you want, Biotech, private message me your nearest major town and I will see about finding someone you can recommend her mom to talk to.
I was molested by my older cousin when I was four and had it not been for the counseling I had within days of that traumatic event, I highly doubt I would be talking to you right now. It is vital to her mental and emotional future that she receive professional care.
Sorry, on an iPhone stuck in traffic