My girlfriends drinks every weekend and ruins the night?

My girlfriend drinks at home on weekends only not alcoholic but she only needs a few and she is out of it we have children together and our time together is precious but she drinks on weekends and goes to bed early. Don't get my wrong I want her to let her hair done but this is really hurting me I have tried reasoning with her but she says I'm just moaning 4 years we have been together and I don't want to give up on our relationship but she is making me miserable and it's having a negative affect on me.
My girlfriends drinks every weekend and ruins the night?
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