Many of these are so small, she'd really need specialized equipment to try. A microscope to clearly see, depending on what it is. . . There are some things that are bigger, like mosquito larvae, but they don't look like white dots. Comparing the swimming style was the only way I could figure it out. . . mine were also Copepods, and harmless.pic?
being at largest 0.1*ish* inches. but that's where YouTube comes in handy. . . Here's one of the first vids that came up with a simple search - there are others that give a better idea of movement, I chose this one because it shows scale a bit. . .tiny white dots on the glass