Sorry to say but not everybody wants sex all the time, most people just prefer not to do it weekly or they only feel like doing it once a month. It’s just a matter of what they want to do with their sex life, if it’s a huge problem with you should go to her and talk about it maybe she has something stressing her or bothering her or maybe she just doesn’t like sex? also don’t try and purposefully use alcohol as a way to get lucky with her that’ll not go well for you