Oh Rain, I am sorry that is not good. Did you ask her why she did it?
I have been thinking about risk, and I think a risk was mentioned up thread about the use of general anaesthetic.
I found this, and of course it is about operations etc but does include about general anaesthetic.
www.patient.co.uk/health/your-childs-general-anaesthetic
"In modern anaesthesia, serious problems are uncommon. Risk cannot be removed completely, but modern equipment, training and drugs have made it a much safer procedure in recent years.
Most children recover quickly and are soon back to normal after their operation and anaesthetic. Some children may suffer side effects like sickness or a sore throat. These usually last only a short time and there are medicines available to treat them if necessary.
The exact likelihood of complications depends on your child’s medical condition and on the nature of the surgery and anaesthesia your child needs. The anaesthetist can discuss this with you in detail at the pre-operative visit.
For a child in good health having minor surgery:
1 child in 10 (like one person in a large family) might experience a headache, sore throat, sickness or dizziness.
1 child in 100 (like one person in a street) might be mildly allergic to one of the drugs that has been given.
1 child in 20,000 (like one person in a small town) might develop a serious reaction (allergy) to the anaesthetic
Throughout the whole of life, an individual is at least 100 times more likely to suffer serious injury or death in a road traffic accident than as a result of anaesthesia."*
If you think a general anaesthetic to have a brain scan is not a huge risk but may give some real benefits in helping your dd can you request this and see what the doctors think? I am sure they will not just give you one on your say so.
I really do not want to be morbid or scaremongering at all but you said your dd tried to commit suicide, not just thought about it or talked about it, but attempted to jump out of a window.
There is a charity I know of that works in the area of child suicide.
www.papyrus-uk.org/
I read some information on children’s suicide but it is quite hard to find up to date info and information from the UK.
www.education.com/reference/article/suicide-risk-children/
I think talking to a charity might help because I think they will take you seriously and might give advice. I am not sure they will be able to help you get to the bottom of anything but they might help you.
Anyway, Rain please, as always, ignore, me if you find my comments unhelpful.