She's sadly one of many. Depression's bad enough, but being genuinely bipolar's no joke at all. She's not going to get over anything any time soon. A lot of her misery stems from when she was young. It's difficult to address something if these things take hold, and her mother's no longer there for her to talk to.
Indeed they can, but Sinead needs her mum, who's not there any more. It seems that she's been troubled since she was young, and family, financial and professional problems've just made things worse for her. Having said that, she seems to bounce back.
Yes there is, but whether they understand some of these tortured minds or not ....... I don't think any "expert" can ever totally understand the anguish which some people sink into, and unless a person's been there themselves, I suppose they can only listen.