i've searched for others with a similar issue and the majority of the responses suggested checking the fish's poop, white and stringy indicating a parasite. well, her poop is as normal as it gets (i believe). it's full sized and brown. is this anything to be concerned over?
here's the best pic i could get while she was trying to copy my sailfin's swimming technique:
here's the best pic i could get while she was trying to copy my sailfin's swimming technique: