Welcome heathery
I'm sorry for the reason your here but you have come to the right place.
A cry for help does appear lightly with your mum, but i think a cry for help is better than no cry for help.
You say She suffers from a personality disorder and depression, this will add to the upset she must be going through. Hopefuly with due medical attention from this attempt at suicide your mum can recieve the care she requires to live a balanced life.
I know its easy to say this and may be harder for you to do.......but try not to judge her.........only she lives inside her head.....
Try talking to her in the future to understand her condition which is probbably the cause of her suicidal behaviour. [if meds are not right the mind can get out of sink....take my word for that...i have BI Polar...]
I hope your mum gets through this rough spell...and i hope you do too
David