Plugged in what way? Can you take a picture? It could be a little feather or something stuck inside. Gently run your nail over her nostril and see if it comes out. My GCC used to get little pieces of her new feather's keratin coating in her nose when she was molting but it came out pretty quickly after she sat picking it with her toenail.
They're usually pretty good about sneezing stuff out, or picking their nose!
If it's not gone in a day or so or starts to get irritated or runny, definitely take her to the vet asap.