customer requests remake EVERYTIME

today me and another barista were on bar. a customer came in and asked the person on register for someone else to make her drink because “they won’t make it right” (referring to me and the other barista). she orders a grande strawberry acai w strawberry lemonade every time which really can’t be messed up. every time i see her she brings her drink to the car then comes back into the store saying she needs a remake. i am so fed up with those who purposely ask for a remake just to get a free drink. i think she knows i’ve caught onto her and that’s why she asked for the shift to make it instead. the other barista on bar has never even made her drink before even though she said that we can’t make it right referring to us. i know it’s not that deep but i’m still a little mad about it :(