She is certainly one of the nicer QH/TWH crosses, this has always been my least favorite combo because it seems like the cross always picks the wrong parts of each horse IMO. (This is meant as a compliment to her) I couldn't pick out any glaring faults that haven't been stated already, and these are minor. She has a nice sloping shoulder, shorter back, high neck set, clean throatlatch, good angles. She could use the hill work as someone said just to strenghthen her belly muscles to get her to carry that back end better so you aren't seeing the "front end isn't balanced with her hind end" so much as you've stated.
Baby is cute too, looking forward to seeing three year old pictures of him!