So ... there really is not right/wrong ... white/black with all this .. its usually all grey area type stuff. The one thing you have to keep in mind above all else ... and this is hard for us fixer types, YOU matter. You need to adopt an alter ego, Clint Eastwood has been used here often ... ya know .. a mans type man. When confronted with a situation like the one you had ask yourself "What would Clint do?" (WWCD?) In this case I think you are fine ... Clint would accept the inite graciously, enjoy dinner and hop on his horse and ride home ... no harm no foul ... Clint would not pine after begging her to have a change of heart and come back home ... You did not share you did this, only that it was a nice evening and dinner as a family plants a seed for later when she may have doubts so I see this as being a good thing provided you stay on the tracks and do not form any expectations.
She is most likely conflicted, but she needs to get to a point where she knows what she wants and pursues it ... in the meantime keep doing what you are doing ... day by day get better.
