Like Kindeyes, I related the part of your story where this had become your "normal". Although my son is the addict in my life, crack was his drug too (until he progressed to even worse) and I know the desperation of an addict with crack.
Your daughter can be grateful that you didn't stay in this toxic relationship. It's sad for her to lose a mother but a peaceful home with one parent will always be better than a home with 2 parents when one is an active addict.
May your days ahead be filled with peace and joy and new dreams and one day soon, wonderful new beginnings.
Hugs