I think she's probably an alright person to be friends with. I feel like you could definitely turn up at her house with a problem and she'd listen to you.
The flip side of that is that she comes across as genuinely unwell. She constantly points out what she perceives are 'flaws'. There's nothing wrong with her nose or face or feet or legs etc but she will make self deprecating comments about them constantly. Her relationship with her own body and image is incredibly poor and it's worrying that that might be getting passed onto the children. I seem to remember her saying that she essentially inherited her tit self esteem from her mother; and it looks like she is trapped in that cycle of someone perpetuating elements of their childhood with their own children.
I did a double take on the 'I hate it here' comment as well and I think every single one of us with children has done something or reacted to something in front of our children that we aren't proud of. The decision to post it on IG is up for debate though, do you post it and continue your 'warts and all' narrative that you've created and are monetising or do you not and then feel disingenuous. Obviously on the face of it it is a first world problem, but we are here talking about it nonetheless.
I hope she figures out who she is, and that she becomes comfortable as a person without needing validation from external sources, I think she'll find parenting (and life) a lot more comfortable once she works that out.