I just noticed that your Princess is 13.....I would highly caution you on using flea products on an older pet. The old, young and ill are more prone to toxic reactions since these products are pestcides......This is from the EPA Office....
The cumulative and synergistic impacts of pesticides can take a heavy toll on animals. Dr. Jerry Blondell, of the US EPA Office of Pesticides, has indicated clearly “not to use pesticides on the old, the sick, or the young.” While some of the literature for the spot-on products does discourage this usage, many dog guardians and veterinarians overlook or disregard these written precautions.
You said you have never had this happen before so you have a good chance to get this under control by much safer ways......Vacuuming is a very good way to catch a lot of the problem, you don't need to resort to toxic chemicals......
Dutch journal Entomologia Experimentalis et Applicata:
The old upright is not only lethal to adult bugs, but it completely wipes out their young. Scientists from Ohio State University had set out to determine what additional measures might be needed to kill a bunch of Hoovered-up fleas: burning, freezing, poisoning, maybe even a little good old fashioned stomping. But it turns out that getting sucked into a vacuum bag does the whole job.
The researchers were so surprised by the results, they repeated the study several times. In each experiment, they sprinkled a kitchen carpet with 100 cat fleas, either adults or juveniles. And they found that the vacuum snuffed out pretty much all of them.
When you have time to order from the internet this is good to spritz on to keep the fleas away.....
Natural Flea Control and Tick Remedy. Official TripleSure Site. Flea and Tick
Good luck......And I hope Princess is doing better.....
