After I completed this quest in FEv0.86 she hung around but was useless.  How do you get rid of her/use her?

Can we bring back the marriage system from EWOM?  I liked that it was kind of fun to get grand kids, load them with sugar and send them off to get killed... well kind of anyway.

The dynasty system is hidden in FE and can be enabled via an edit of some sort, but currently it's not going to be resurrected. Perhaps in the future, though.

I think she is waving to you. 

I miss the marriage and dynasty system for the cool feeling it brought of being in a consistent world. The attempt to tie it into the diplomacy system was not very viable, but that was not really its charm for me. Getting a new free champion every mumpteen turns (births were infrequent) was a very minor benefit, but added a lot of flavor.