At the end of the day if your niece wants to keep the baby there is nothing really anybody can do as hard as it is for you. There are so many people out there who would make good parents and yet you are stuck in the middle of a situation that sounds awful.
I wish I could give you constructive advice but all I can suggest is that you carry on behaving as a concerned aunt - your heart is obviously in the right place. If your niece will listen to you let her know you will be there if she needs support (without letting her walk over you).
My thoughts are with you.
Montravia
