SNEEZE SNEEZE SNEEZE

So, Penny, one of my guinea pigs was sneezing a bit last week.  Nothing progressed so I assumed she was fine.  I even told the vet not to worry about getting any medicine for her because she's fine.  She might still be fine, but why is it after I tell the VET she's fine does she sneeze 10 times in a minute?!  Could it just be the hay irritating her?  UGH UGH UGH UGH!!!