[quote=@DarkwolfX37]
<Snipped quote by Host>

Because we're not dealing with a specific instance. We're dealing with everything. Non-concept things. Almost everything actual has both magnitude and direction, so when the ability affects actual things, it affects almost everything. If we were dealing with the study of vectors, it would include a lot fewer things. But we're not. 
[/quote]

Technically she would only be able to control vectors in three dimensions, considering time could be considered a vector.