What does gum color have to do with breed?
Her coat appears too long for a bull breed. But her head shape looks like she could have some bull breed in her.
People are always so quick to label a rescue. Fact of the matter is, rescues are almost never actual American Pit Bull Terriers. They're almost always just random bull breed mixes. Usually AmStaff, or AmBully. But you can't discern the difference in a mix thereof without any pedigree.
So just love your beautiful girl for what you know she is. A beautiful, sweet faced puppy whom you love.
"i can explain it to you, but i can't understand it for you."