Always hungry after BF

My LO is 2 weeks old and seems to be hungry after every time Bf. She usually feeds for 10+ min on each side. She was early and tiny (5.4lbs) and had a hard time latching so she still uses a nipple shield and I was supplementing with pumped milk in a bottle after every feeding. I’ve now tried stopping the supplementing but she never seems full and could stay on the breast all day (or downs a bottle with 30+oz after BF) Does this mean I should still be supplementing with bottle? Has she just gotten too used to this? She’s gaining weight at a decent rate but just always seems hungry and this makes her fussy! Any advice?