Thank you for your point of view Bigboots
I'm not going to go into everything again, and although it may seem I 'spill the beans' on everything that's gone on, there are some things I don't disclosed. One thing that is for sure, my estD would never have harmed her babies.
Yes she had PND, [hidden from us till later] made a 1000 times worse by her husband telling her she was a bad mother, a bad wife, a bad housewife [all untrue] & that his mother told him daily to divorce her. All this I learnt after I made the mistake of mediating to get them back together. Yes the timing of their big argument was definitely planned for when I & her sister were away, so therefore we couldn't help her.
Sectioned means you cannot just walk out of the hospital. When the doctors called her dear husband the next day, to come and collect her as she just had the 'baby blues' so was fine to be released into his care, his answer was No!, I don't want her back, she can stay there! This he told me himself, in one of the hundreds of phone calls he made to me during this time. She was then released into my care, if there were no one for her to be released to, she would still be locked up now, just how her dear husband and his mother wanted it. They didn't love her, shown clearly in their actions!
Your wrong about the Police not being able to arrest and section someone under the mental health act, they can and they do.