That's the core issue, you never really did fix anything for her, you could not and cannot.
You just are not that powerful.
If you were to call her tonight and beg for her to come back, you will be even more miserable, and she will not get sober because you want her to. You do not hold the key to her soberity, she does, she must want it more than anything or anyone, that includes you.
I know you are hurting, forgive yourself and her, move forward one day at a time, left, right, left, right.