My heart goes out to her daughter. At 13, she's in that horrible age where she'll be aware enough about the subject matter but maybe not well equipped enough to deal with it.
I've said this before but I'll repeat myself. Mental illness is a struggle and you don't have to do it alone. The help is out there if you need it. I've been that stubborn guy before that thought he could go it alone and it nearly cost me my life. If anyone wants to talk, you can always PM me. No judgement, completely confidental. I don't profess to have all the answers but talking helps.