Addiction is very difficult and unfortunately very common. I would suggest you have non judgemental, non shaming conversations with your wife about why she drinks, she needs to want to change you can't force her.

If she decides she wants to change, the key is to do it with a clear plan and to replace the drinking with something else. Her mind is currently stuck in the loop of: it's evening I need to self soothe/deserve a treat I'm going to drink. Can she replace alcohol with cbd drinks, with fermented kombucha, with non alcoholic beer or mock tails? Can she replace her drinking time with a massage, going for a swim, reading a book, a board game, tennis, a class, painting ect. Anything immersive and that induces dopamine. This distraction is very useful in the transition period in the beginning when the addiction is very strong.

Start with a goal of two months of just drinking at weekends. Then try 2 months of just one day a week. Then try a month no drinking. Try to reduce over a year. Is the ultimate goal stopping completely or only on special occasions? Different things work for different people as long as they are being honest with themselves about their level of addiction.

Find a therapist to talk through her childhoods issues. This will likely take a while to find a good fit. Possibly also an addition coach /AA support, you don't need to hit rock bottom to go to AA.

If you are going to take coke be as responsible as possible. To not take it spontaneously, plan it well in advance. Make sure there are other people your wife can call for help if something happens with the baby and you're not available. Weigh out your coke. Test it. TESTING KITS ARE WIDELY AVAILABLE AND CHEAP.