I agree she's a witch. I don't want to say i feel sorry for her. But shes clearly not doing great. She's completely lost her way, she has no style, no personality. She does probably have PND.
She's in a rut, stinking dirty house, no structure, no routine, no friends to guide her! I've had PND, I really struggled with my 1st. It was awful, everyone could see me going downhill and tried to force playgroups etc. The best thing for me was going back to work, it gave me routine again and I found life easier to deal with.
She needs to help herself. We all know she reads here! Go to playgroups, meet some friends! Get a job, even if just to meet new people and get out of the house alone! Set aside time each day to properly clean the house! Its surprising how much better you'll feel!
With a bit of adult influence she may start acting like an adult instead of a stroppy child!