Is my baby drinking enough?

My baby is currently at 10weeks. Born at 37weeks, 2.6kg. Now she is at 4.7kg. Since last week, she has longer time of sleep at night but same to less amount of milk per feed, making it a less of total per day. She is active and happy during wake time. She seems to be the same mood than before. I am waking her up again now every 3hrs and force her to drink more as the doctor said she is drinking less than normal (she drinks 70-90ml per feed) but she just spits it up (I am making 116ml).I don’t know what to do anymore. Should I just let her sleep and drink the ml she wants, or wake her up and force her to finish the milk.