Babyluv
It's really hard when they're like this. I think there could be a few things going on. It sounds like she's doing most of her feeding at night and sleeing during the day - would be nice to get it the other way round. Do you get out much? Where does she sleep during the day - is it different to where she is during the night? Have you tried feeding more often during the day?

8-10 wet nappies suggests she's getting plenty of milk from you, so give yourself a pat on the back for that I would guess she's getting a sore tummy too - extra milk probably won't help that and introducing different milk could even make it worse. I know there's this theory that formula will make them sleep, but it doesn't always work that way.

Does your partner help with settling at night? Sometimes if dad takes baby away from mum to rock, sing and cuddle she will settle without a feed.