Just read your thread moominmama86. I really think the best adivce is to go back to the gp, as eddm and jimjams say. I am no expert in this, but have seen how getting someone sectioned can be a postive step to take.
Several of my close friends have been sectioned at some time. Things got too tough for their families to cope with, and in each case the friends were not taking their medication. The friends came out of the mental institution in a much better state than when they went in and were given better coping strategies and medication they were ok about sticking with.
I'm not going to pretend it was all happy and positive, but on balance, from an outsider's view, it was the only thing to do at the time.
There is no way either of my friends would have asked for help themselves - they needed to be sectioned in order to get help.
It may be that a new consultant, fresh diagnosis and treatment will work for your mum, but if not, please don't think that sectioning someone means all hope is lost. It could be the beginning of recovery.
I agree you need to keep the medics updated all the time(as suedonim suggests, can you video anything?). Definitely tell the medics loud and clear about the changed circumstances at home - you are living there, you have a child and your mental health and ability to care for your child is at risk.
My mum looked after my dad for much of my life - he had mental problems as a result of a big breakdown followed by ESP treatment in the 60's. She also looked after my grandmother who ended up with senile dementia when I was a teenager. We lived in my grandmothers house. I saw at first hand how the strain of caring for mentally ill people affected my mum. I am amazed that she carried on at all. She was lucky in that the medics were sympathetic, but it took lots of effort to get respite care and god, did she need it. My mum to come extent chose to care - she stopped trying to escape. It would have been easy to divorce my dad but she loved him. She refused offers right to the end to put my grandmother in a home. The more she did, the more the rest of the family looked on her as the carer.
She moved to my grandmother's house with me when she was in her mid 40's. At the time she and my father were not getting on. 5 years later my father moved in with us too. Somehow she took on the role of caring for everybody - she had no freedom, no life of her own. Her sense of responsiblity made her unable to leave and slowly she got used to the life she had and did not want to strike out on her own. My father died when my mum was 79 and that was the first time she had had no one to care for. I don't know why I am tellking you this, but I suppose your situation now in some ways reminds me of the one my mum was in when she first moved to my grandmothers. Sorry for rambling - hope you and your dad have made up after yesteday and help each other through this.