Will, how long was your lady friend married before the divorce? The longer the marriage, the longer it will take for her to grieve, lick her wounds, and adjust to being single again. Speaking from my own personal experience, a year isn't long enough to recover and start a new relationship.
As far as her 17 year old daughter, I agree with Country Girl's advice:
"Perhaps you could invite the Mother and her daughter out for some fun times: movies, ice cream, dinner. Just to get to know her and for her to get to know you. Nothing rushed. Take it very slow, and I am sure with honest and open communication between you and your friend, that things can be worked out. It will just take time."