My 5 month old I ebf and have recently started supplementing about 2 oz of formula in a bottle every…

My 5 month old I ebf and have recently started supplementing about 2 oz of formula in a bottle every couple of days. I try to give her 4 oz but she knows it's not her mommy's milk and never finishes it, finishes up on mommy😕 Haven't been away from her since she was conceived, and trying to save up enough milk so mommy and daddy can have a night alone together but honestly don't know how I'm going to go a night without her😢💕💕💕