Keeping in mind that Governor Blanco is a Democrat, she may have been slow to call in the national guard on a full scale manner.
No. The national guard is under her control in this circumstance, so the more she has, the mopre work can get done.
She has the power and authority to call and direct them - ahead of landfall, after landfall - they are hers. Likewise National Guard lent by other states, they report to Blanco unless she agrees to have them federalized.
She was slow, but not becuase it would result in loss of control.