Breastfed baby help

Ni

I’m 2.5 weeks from 6 weeks old my baby’s weigh gain seems to have stalled. She has been very fussy but I put it down to the leap and she’s still giving plenty of wet nappies so I’m just a bit confused where I’m going wrong. She feeds I would say every 3-4 hours and they are fairly quick but I assumed efficient as no latch issues and the weight gain up to week 6 was fine. Feeling a bit low over it as feel like I’m doing something wrong or my milks not good enough. I’ve been trying to offer more frequently but she just gets angry and fights away from it. Sorry for long post