when to put my foot down

My partner (25Female) is slowly drinking more.
It’s not a big deal in the week days, but some times she goes out like today on a thursday and get way to drunk, like she always does when she drinks, and are not coming home until late at night. She also has work tomorrow at 11.00 am, it’s 23.05 pm while writing this post (Europe)

Her mother is a alcoholic, with a alcoholic partner. They drink usually non stop from thursday’s until tuesdays. Rest and recover wednesday, and the loop continues.

My partner (25) says she does not want to become like her mother, but her mother and grandfather are both alcoholics.
She loses control when she drinks, and I’ve asked if she can show me she can control herself and no drink so much, but it’s not happened yet. Usually never hangs out with friends unless there is alcohol.

I’m starting to get worried, because it’s become increasingly more alcohol at weekends and now more during the week as well.

She got anxiety from before, which enhances like crazy if she drink too much the day before.

How do I tell her to start consider that, since her mother is an alcoholic, maybe she should not drink so often?..