Its nothing serious really

it's the snot drying up and staying in her nose

 I just asked a similar question, my cat has it too, but it is very much like his eye sleepies and he has it pretty much all the time. The person who answered me said it was normal. It is just gunk that gets dry.

 My cat has this too! My husband and I adopted him from a local shelter a few months ago and I never noticed anything until recently. At about the same time he started getting the black gunk we also discovered he had fleas. I thought it might be flea dirt but now the fleas are one and the gunk remains. I clean out his nose, gross, but I do almost every day and everyday it's back. It's weird. If anyone can tell me why this is I would love to know.