If this isn't neglect then what is?
There's been no antenatal or postnatal care whatsoever - that's medical neglect.
She's going to be struggling to keep baby warm.
Keeping baby clean without access to hot running water is going to be difficult.
If she's having trouble with her milk supply, how would she sterilise bottles in a tent?
There's likely unsafe sleep practices going on.
I have no doubt that she wants to be a good mum, but camping in a tent presents so many practical barriers to that, so much so that I'd be certain baby's needs aren't being met in several ways. I'm sure she loves the baby, but sometimes love isn't enough.