UglyGlassVase Have you ever lived with someone who was sectioned? People on here like me have had some shocking experiences which is why the presumption is her daughter will have been ill to have been sectioned.
I agree with @UglyGlassVase and yes, I have personal experience. Not that personal experience is relevant here.
OP I would definitely encourage your daughter to get a IMHA if she hasn't got one already. It might well be that your daughter needs to be detained and this is the best place for her. However, you have every right to question that and shouldn't be told by people that you are just in denial. Your daughter has rights under the MHA for a reason.
I have known people who needed detaining who weren't because of the high threshold but that does not mean everyone who is detained really needs it. Mistakes and poor care also happen.
I am not saying that OP's daughter should or shouldn't be detained. I do not know her, nor am I qualified to argue the case either way (and no one else here is either as they do not know her).
We should never get to the stage where we trust 100% that professionals will always make the right decisions, especially when it comes to our human rights. If there are any concerns people should be empowered to question that, they should not be shut down.
OP best wishes for you and your daughter 