supplementing question

Bre

i made a rule to let baby nurse from me for atleast 30 minutes before i let her have donor milk... if she pushes my nipple from her mouth after atleast 30 minutes and falls asleep do i still try to give her the supplement? i have to supplement because of her weight loss (shes 4 days old today) so i dont want to mess with it but i also dont want to overfeed her.