You’re doing as much as you can, your daughter is happy and healthy. If she was starving she’d wouldn’t be weeing and pooing.
The difficult part of breastfeeding is often that it takes time for you to see a change. There’s a lag between increasing stimulation and increasing supply, between increasing supply and weight gain, between a baby having their tongue tie divided and getting the muscle memory to latch better.
It’s natural as a mum to focus on your supply. But as you said yesterday, she’s likely been unable to transfer milk effectively. As her tongue heals and she gets used to moving it more, her latch will improve. It’s impossible for me to say definitively over a forum, but one possibility for her taking fewer sides last night is that she actually had a really good, effective feed - so got more in less time.
It will take a good 24 hours or more to see the effects of power pumping. The first time is more to increase stimulation.
Easy to say, but try not to look at how much is coming out. Letdown is a bit like a watched pot. Lie next to and smell your gorgeous girl while you do it.
A lot of women don’t get a lot of milk with a pump. You may get more hand-expressing.
Hope you’re having a well-earned sleep now and have someone to help look after your elder child, so you can rest. Go easy on yourself x