I’m not coping

Your not failing her at all maybe she has a wind pain? How is she pooing? My little girl is like this and has reflux xx

This is so normal and it’s nothing you’re doing wrong, it’s around this time that babies are trying to learn to poo properly by themselves, it’s hard for them to push and open their pelvic floor at the same time. So essentially they are pushing against a brick wall! Hang in there it does get better I promise ❤️
I’m a mum of 3 and all done he same around 4-7 weeks xx

You aren't failing. Babies can just need more closeness. Mine was the same at 5 weeks. I dont have much advice other than now at 7 weeks she is better, so maybe growth spurt?
I was doing bicycle legs with her to get things moving half the night, plus infacol, so you could try that. But mostly I think she just learnt to pass wind by herself.
But if you're still struggling definitely get in contact with the health visitor/ GP.
You're doing amazing. These tiny humans can be so trying, but hang in there and definitely ask for help or someone to just hold her so you can have a break if you want it.