I have a 2 year old female cat who has been looking like she is tearing up lately. is it possible she has some kind of allergy? or could her sinus's be bugging her.
Yes definitely she could be having sinus and/or allergy problems. Is this what you mean by crying, tears in her eyes or that along with her being vocal?
It could also be an upper respiratory infection. Does she just have the watery eye or is she sneezing too? I would diffinately take her to the vet to be sure though.