I agree.. write a letter to her and tell her you miss her.. that you need her and that its okay for her to let her loved ones help her with this...

Tell her that as long as she is hurting, you are hurting too... and that all you want is for her to feel better and be happy...

She loves you... she is going to want to do whatever she can for you... but she is also angry and having a hard time with this..she may feel like a failure...she may be angry that the depression is taking over her life....

Everything is going to be okay... you did good coming here... maybe what she needs is a good support group ... where she can go talk about it without anyone knowing who she is...

Stay strong... she is blessed to have you for her daughter.. and she will remember that....