If she really is pregnant with your child - you need lawyer.
And btw what are we 16?! - CONDOMS!!
You have a right to protect your unborn child. This woman that you say has a good heart and has great potential - is a drunk FIRST. Chooses alcohol over a being a good mother.
She's left her children alone to go drink and God knows what else. Driving drunk wiht them in the car, passing out drunk while they are home...?
And you're going to trust her with the life of your child - if it's even true.
Drunks will do and say anything to get what the need/want at the expense of anyone ever their own children. And she needs to be controlled in this case. She needs to know there are consequences for her stupid, selfish actions.
Earlier you said she admitted to not being responsible enough to have another child - that's probably the smartest thing she's ever said. Your response - your right Hey sweetie, meet my LAWYER!
Good luck