Well, they're a robot assistant who's duty is to provide japari bun to friends who live in various environments and places and a replacement to look after the friends, so they should be able to swim at least in order to fulfill their duty
The power scaling of Arknights characters is so all over the place...
I mean, she does that thanks to her art so while it sound like she is some superwoman shit (well she kind of is in a "wreck everything" way), it is just a thing her art allow her to do.
Kinda had a hard time deciding on the clothing tags here, is this yoga pants? It's definitely not her typical one piece bikesuit, so I'd guess so but I left it out since I was unsure.