NICU baby and breastfeeding?

How did you produce breast milk while your baby was in the NICU? She's been in the NICU for 9 days and I feel like I'm losing my milk. I had the little balls in my breasts 5dpp and have been hand expressing or using the manual pump but I don't feel the balls these days so does that mean I'm losing the milk? I never get more than an ounce anyways.

We don't drive every day to see her, we usually go for 2 days then skip one day and then another two days and skip another day because it's 3 hours round trip. We can only spend one hour with her, two maximum if they're not really focused on how long we're there for.

I feel like I might lose my milk because she barely feeds when we are there. She literally has only latched on 2 times for maybe 5 minutes total.

Any tips on how to keep milk? Hoping she can come home this week 😪