Traci...(you are a busy one!) I vacuum every day, have discarded old throw rugs, scratching posts, beds, etc...washed all kitty bankies, etc,etc. There is no evidence of fleas on her or in the house. (but I know they could be lurking...).Would you repeat the FrontlinePlus again in 30 days just to be sure?
I wouldn't, but you kind of have to play it by ear, go through the house every day looking for them until the 30 days has past. Continue vacuuming every chance you get, including vacuuming the furniture until then, then do another thorough search just in case.