Lactation frustration

Kenzie
I've been supplementing since day 2, so I never gave my supply time to fully, independently establish itself. Since then, the girl has started to sleep through the night, so I've dropped 1-2 night feeding. Now, I've gone back to work where I can only pump twice a day (home by 3). My supply has dwindled to nonexistent!! Maybe 2oz this morning after taking fenugreek last night before bed. I've tried power pumping and have added the lactation plus supplement from honest co twice per day, what should I do? She didn't gain enough at her two month appointment but I don't want to exclusively formula feed her yet.