Alas I don't have any experience to share, but I can share my support and thoughts. Sounds like a tricky situation for you...watching your mother hiding alcohol use is tough, but considering you're in recovery yourself it makes it even more complicated.
I would guess the best answer would be to relocate yourself from that situation. Easier said than done, I'm sure - I recently spent a week staying with my mother and it was more out of necessity than choice, so I can understand how you might feel "stuck". But it would probably be best to avoid any kind of interventions right now, much less one with your own mother. If there's somewhere else you can stay and work on yourself right now, that might be best. Good luck!