Take her to a vet.
In the meantime, make sure her pellets don't have those end bits (they are dusty and can get into her nose). Ensure she is not exposed to perfumes, sprays, etc. They breathe only through their nose (as far as I know, whereas some animals also breathe through the mouth), and this will make it incredibly difficult for her to be comfortable, and thus cause stress. Watch to see if she is eating hay and drinking water as normal.
She may have something in her nose like a tiny piece of hay. I had a similar thing happen and took one of my rabbits to the vet and she didn't sneeze a single time, and because the vet couldn't see anything in her nose and there was no white discharge- the vet didn't perscribe an antibiotic. But then a month later she did have a white discharge so perscribed azithromycin and it cleared up.
It's also possible but rare that she may be allergic to the type of hay you are giving her. I had a rabbit that every time I would start a new bale of hay she would start sneezing and have a runny nose. cleared up after about a week or so and didn't happen again until I opened a new bale of hay. I think it was just an allergy to the type of hay. But mine was a mix so there was no way to know which one was bothering her unless I were to buy a bunch of different bales but she was going to a new home so I wasn't too concerned about it. I told the new owners and I think they figured it out.
Hi I have a rabbit that’s sneezes but he has snuffles . Best thing to do is not use sawdust , freeze hay and don’t use any sprays or anything around bunny and see if that helps . But I would go vets just encase . Good luck with your bunny