Hi bp, and Welcome to SR!
Glad you found us! You'll find lots of great information and support here.
I agree with the others in that none of us can tell you whether you should stay or leave. What you will hear from us is that addiction is a progressive disease, and the addict cannot be helped unless he/she really wants to change. Once the addict grabs hold of recovery with both hands, then things can begin to change!
For us, we learn something called the 3C's:
You did not cause the addiction.
You cannot control the addict.
You cannot cure the addict.
I always found these to be both really frustrating and finally really freeing. It's not my fault!!! I'm not responsible for the consequences of their behavior!!
In my opinion, you instincts to protect your baby girl are spot on! She has no voice and no choice in this matter, so she needs her one healthy parent to protect her.
Stick around, we're glad you found us, although sorry for what brings you.....
HG