I think that aeh can best explain the significance of your DD's scores. I can tell you, however, that my DD10, like yours, had a high PSI on the WISC, but a somewhat lower WMI (your DD actually has both a higher PSI, as well as a higher WMI). In real life, DD is quick to learn, but impatient.
One challenge that I have wondered about is whether DD's mind is impatient with repetition, but may SOMETIMES need it because of her lower WMI. In my DD's case, however, I think that her high reasoning abilities help her often work quickly and accurately. Also, she seems to remember things not by rote, but by the connections she makes (she has a very curious mind). Still, as she encounters the need to digest more and more information as she moves through school, I predict that she will eventually need to learn to develop her memory to do her best at certain tasks. Right now, she almost never studies (which I do not think is a good thing).