Hey sweetheart,
I know how tough this on you, what you're experiencing is complicated grief associated with P.A.S.S. In time, you're therapist will teach you some techniques to help you deal with these emotions. While you'll never forget what happened, you'll be able to cope a bit better.
I know it's not what you want to hear, because you don't want any other baby but Sasha-Lou, but one day you will be able to experience motherhood, without your parents being able to force you into anything.
You can't go through life blaming yourself and feeling guilty for this, because in all honesty, it wasn't your decision. You did what you did because you weren't given another option. This doesn't reflect on you, your character or your future ability to be a mother. You're a strong, intelliigent and beautiful young girl, with a bright future ahead of you.
About your friend, talk to her. Just be honest about how you're feeling, as your friend she sould be able to try to understand what you're going through. Also, try not to get too involved in the all the preparation like buying clothes, chosing names etc honestly, it's not going to help you right now. Stick to your therapy

lots of hugs and good luck!
E xoxox