I've never dealt with this. Is it crusty dried goo? I'd try gently soaking it off with warm wet compresses to get a better look.It's like rock hard. I was gonna try to wiggle a q tip around it but my husband told me not to but how is she suppose to close up and heal with what seems like a rock inside her vulva?
Personally if it were me I'd get a vet involved because they need to free drain to clean out what's building up could be an infection.