Think your DD is an exceptional player. Coaches dream. If she is not pitching she is still on the field. There are many pitchers that can not field a gb or fb and have weird overhand throwing motions.
We have another pitcher on DD's HS team who also fields (and another who is a pitch and sit) - and ALL our pitchers in travel play the field though one is really a 1B only when she does field. I guess I don't see it as unusual because that is what we have always done through all ages. In travel the fact that they all take innings off before they start and also after a start is one of the reasons we rotate player positions so much.
I think too many pitchers are pressured into becoming sit-and-pitch players too early which is great if it is really all you want to do or if you are clearly always are going to be the best pitcher - however it sucks when you are not. Our HS pitch-and-sit pitcher is going to be a sit-and-sit pitcher this year - it is not going to be a fun year for her.