Colleen - Nice representation on that image of the low in central US--with counter-clockwise flow and W to E on its S side. That is going to be the major steering influence in association with the front approaching from the W. Against that flow there is no way for Wilma to get further W once she is in its grasp. The opposite was true for Katrina/Rita -- they were running along the S side of high pressure with Clockwise flow.

The question of how far N Wilma gets on the Fl peninsula is influenced by where the front is when Wilma gets there.

Without the winds the forces of spinning bodies direct them away from the equator so tend to drive them N in the Nothern Hemisphere.