Are you the first guy in her life after the death of her husband? Maybe your a rebound? I'm concerned that she's introducing you to her children already as well. If she keeps introducing men to her children before the honeymoon period is over, then they're going to have a whole lot of men coming in and out of their life.. not good. *steps down off soap box*
Anyway, I'm wondering if you're a rebound and now that she's feeling better about herself, she's feeling less about you???
You need to step away and let her call you when she (thinks) she's attracted to you again. I'd watch your heart with this one even if she does regain the new relationship energy with you.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion