I had the same problem was breastfeeding he couldn’t latch was rapidly losing weight so within a week I got his tongue cut. Realised he was also dairy intolerant after swapping to formula and got him prescription milk. A week was bad enough to hear him in pain and crying. Granted it took a few weeks for him to settle but he is absolutely thriving now. She just needs to get it sorted you don’t have to just put up with it. It’s like she’s doing it so her life can be harder and she can get more sympathy??
This is what I mean!!! It's like she can't be decisive and get things sorted for either of them - it can be difficult having to try things for a while and wait for a difference, but at least get on with starting them!
I used to be the shyest, most indecisive person ever, but I know something was wrong with my eldest boy and I had to basically go to war for him as no one would listen - spent days camped out in kids a&e, arguing with Dr's, the lot! By the time I had my 2nd and he was similar, the Dr's just asked me what I wanted to try him on and off we went

It still doesn't come naturally to me, but you have to be strong and assertive for your kids - she is utterly useless, but we knew that anyway from her complete ignorance with poor River's difficulties