That's good! It means that she'll do tasks faster than the others will because she's running everywhere. A trip to (say) the berry bush takes much less time, so she can get more in. Later, it might be an idea to train her in building as well, as some of the tasks entail carrying rocks right across from one side of their home to another. So she'll also be able to complete building tasks faster as well!

Just don't 'waste' her on research or medecine.