It doesn't really matter whether she thinks she has a problem or not....YOU know she has a problem. If you provide the alcohol to an alcoholic, then you are seriously enabling her. You are allowing her to continue the denial. It doesn't matter if she drank 1 or 100, you can't expect anything to get better if you're making alcohol available to her.
You're new to all this, so I know it's all confusing. I don't recall if you're involved in AlAnon, but if not, please consider finding a group near you. It will really help you work through all this and make good choices moving forward.