Welcome to the forum!
Did you SIL ever visit a psychiatrist to get an evaluation and diagnosis? If not, please encourage your brother to get help for her. Take her a to a psychiatrist and they will be able to provide help for her.
Please also view our resources section where you can view a listing of helplines: www.healingwell.com/community/default.aspx?f=13&m=350839
I hope your SIL will find the help she needs.
Moderator - Bipolar
Depression, Borderline Personality Disorder.
Chronic Pain - Cervical Kyphosis, Cervical Spondylosis, Thoracic Scoliosis.