I have 5 bedrooms, 3 full bathrooms, eat in kitchen area, kitchen, formal living room/dining room, family room...3K SQFT...I don't have them clean (when we had a cleaning crew come in) the den (one bedroom) and the guest room...it takes a team of 3 about 3 hours to clean.
if she is actually doing the baseboards, closing doors and cleaning behind the door (I had one company that didn't do that) or vacuum/sweep under the beds - then yeah, she might need more time...do you like the job she did? were things cleaned? were the appliances in the kitchen moved and cleaned behind? was the toaster cleaned out? for me? it's all those little things...
if she doesn't go "above and beyond" then you might need to find another person to come in and clean..