My Wife is having constant challenges with her 14 year old daughter.

D14 is very unhappy with herself and with her life.

Among D14s problems in the past were:

Her father committed suicide before she was born
Her mother doted on her
Her mother later married an emotionally abusive man and had a son with him.
D14 never felt loved or accepted by mom's husband.
Mom got divorced when D14 was 8
Mom found new, emotionally distant guy (me) who only superficially appeared to like D14
New guy was often gone, leaving D14 to look after younger brother while mom works nights as a nurse.
So much pressure on D14 she starts finding comfort in sex from older boys, starts cutting herself, smoking, drinking, doing drugs...
Police get involved several times
child services get involved several times
Mom is freaking out and doesn't know what to do
New guy is able to mediate between daughter and mom but not able to love as firmly and strongly as required.
D14 starts lashing out physically at new guy (me)
Things rapidly deteriorate even further.

Finally! mom decides to dump (divorce) new guy
things seem to be better now that he is gone and it's just me, brother and mom again

But I know I am still unhappy and messed up...

I am still required to be the parent when my mom is away at work
I am doing my best with that and I love my little brother
but I am caught somewhere between childhood and being an adult.

I wish...

I wish...

I just wish I was happy and I wish my mom was happy, too.


I am being the possibility of:

1) Integrity
2) Loving myself completely.
3) Things flowing naturally between us, without any fear or attachment to the outcome.

"It's do-able." What are the actions now?