As a daughter that had and has meltdowns still to this day, being sober is the best thing for her. (and you)
If she see's you running to alcohol everything your stressed, than she (someone already full of emotions that are hard for her to control and manage) will do the same at some point.
My own daughter is taking after me more and more. I have plans when she is a touch older to get her into therapy to help her sort out her emotions, something I wish I knew how to do myself.
Deep breaths in and out.
I've been on both sides and its not easy, being the daughter or the parent.