I don't think that it's boogers. My cat Sunny used to have black specs on his nostrils and I thought it was dried blood. I asked my vet about it and he said it wasn't blood but that it was caused by allergies. I forgot what he called it. He said it was probably food allergies. I started feeding all three cats different dry food and now the black spots are gone. It took about 3-4 months before they cleared up. Maybe this is her problem. Good luck.