It seems like you need to slow down when writing. I do feel the rushed sensation that your character exhibits, but not in the way you’re intending. It feels as though you’re typing away, paying little mind to the words that came before. It kind of jumbles together. I think spending some time editing would benefit you. This is evidenced by the fact that you end the story mid-sentence.

Also, covering 20 feet in one minute should not have anyone gasping for air. A 40 yard dash is usually done in 4-5 seconds, which is 6 times further than 20 feet.
Finally, it looks like you forgot to sequel part one when creating this. Another piece of evidence to suggest you’re rushing things too quickly.
Apologies for the multiple, successive comments. I had more to say than the character limit.

Oh, by the way, there is supposed to be humor implied in the fact that she covered that much ground in that amount of time. This is supposed to show that she is not athletic at all (as you would expect a child genius not to be), as she uses her brain more than she uses her physical body. And sorry about not sequeling, I’m kind of new to the Ficlets thing and I forgot about it.

Ok, I can see that. I think 20 feet in a minute pushed it a little too far, making me think it was an error. Maybe try something along the lines of 40 yards in 20.7 seconds or something. Many people can relate to 40 yard dash times, and might more quickly recognize what you are going for here.
No problem on forgetting to sequel. I had previously submitted a feature request for just this sort of situation. Connecting stories after the fact could be useful.