Baby not gaining weight like she’s supposed to. Help!

Hi, so my baby girl was 5lb 14 oz at birth, 24 hours later she had lost 11% of her birth weight so she was at 5lb 3oz, next day she had made it up to 5lb 6 oz so we were clear for discharge. Now at her 2 week appointment she was only at 5.97 lbs, so we’re almost at the 6lb mark but the doctor is not happy with that. So far we have been fortifying my breast milk with formula and we’ve also been doing 223 oz of water with 4.5 scoops of formula (both at the drs recommendation) and trying to feed her every 2 hours. At night we tend to go more like 3 hours in between feedings which I’m going to make sure we don’t do that anymore. The dr wants her eating every 1-2 hours and eating at least 4oz per feeding. How do I make this happen? Most of the time she’s impossible to feed because she doesn’t want to wake up, and when she does wake up she only eats 2oz at the most. I’m just trying so hard to make my baby girl gain weight and I don’t know what I’m doing wrong ☹️