Breastmilk for NaICU baby?

When I had my daughter early she only did about 50mls at the most before we brought her home. Depending how long her daughter is there it could get up to about 3-4oz a feed but starting out it’s not much since their bellies are so tiny

It's a nice idea, has she asked you to do this though? If she wants to breastfeed herself she'll set up a pumping schedule to establish supply and she might not want to supplement with your milk as it could affect her supply. They only drink tiny amounts to start, I wouldn't set any aside just see how it goes with their feeding journey. I ended up pumping a lot more than my daughter was drinking, they kept it stored in the NICU fridge and freezers but there's only so much room so we had to move it to our home freezer.

I understand what you're saying (although baby would not be a micro preemie at that gestation), but as a parent of a baby who spent 7 weeks in the NICU(following bowel surgery), I would not appreciate anyone else questioning my feeding choices. It could come across as you doing that if you are trying to donate breast milk without being asked. If she chooses to use formula that's her choice to make. I met plenty of mums who did because it was too much for their mental health on top of everything else. I'm not saying you can't offer but I'd be really tactful and kind about it and not insist or try to tell her medical reasons to accept, she's got enough on her plate. And I say all this as someone who did breastfeed until my daughter was over 2 years old.