Hello crazyhatlad.
There could be many causes for your cat sneezing.
You are right, cats can develop allergies the same as we mere humans. Unfortunately, discovering what the allergy is could be a problem.
Cats are also naturally inquisitive and he/she could have gotten a small foreign body lodged into his/her nasal passage which will make her sneeze.
Another possibility is a nasal polyp.
There are also other more serious problems such as a form of flu (Parainfluenza Virus), although if sneezing is the only symptom she is showing, I feel it is unlikely to be this.
My advice must be to take your pet to the vet and get a proper diagnosis. If she has got a polyp or an obstruction it must be very uncomfortable for her.
For more information about sneezing in cats please visit:
http://www.thepetprofessor.com/artic...le.aspx?id=289
I hope this has been of some help to you.
Good luck.
Poseidon