Many of us have had the experience of a pet choosing us instead of the other way around. Usually it's about other types of creatures - in fact, it sounds a little silly when applied to a fish.
Suggestion: take your daughter to the fish store and walk past lots of tanks and fish, and see who follows her. My guess is there are other types who will do the same.
I chose my latest betta based on him "stalking" me at the store. I was only in for supplies, but every time I passed the betta cups he alone would move, and it was to follow me as far as he could in his limited space. When I passed by in the other direction, he did it again. Curious, I started going back and forth, and sure enough, he was pacing my movements.
Fast-forward to later that day, when I had my new fish in his tank at home and he was wagging his tail and doing backflips - literally - every time I walked by. A year later the betta has calmed down but still gets excited and happy when it sees me. Maybe something to look for in a marriage partner...