Lots of milk in the morning, hardly any in the evening

I know I never run out of milk so to speak, but in the morning my breasts are heavy and full of milk and up until 2pm my baby will feed very quickly and get her fill, but then after that point her feeds become longer and she becomes frustrated, she will nurse for ages and seem to still be hungry.

It's to the point where I'm having to do a formula bottle around 9/10pm because otherwise she will be latched for hours into the night and not get her fill at all.

How do I mend this issue? I want her to be happy after every feed and I want to be EBF. My baby is 2 1/2 weeks old.