I found a puppy in the road

I found this puppy in the road it stopped my car I got out. The puppy came right up to me. She was really tired. I picked her up put her in my van. I gave her some water and a little bit of food, but she went right to sleep and slept for three days, I had to wake her up to go potty and feed her but then she went right back to sleep. I’ve had her 10 days she starting to stay awake during the day. She eats well and she’s potty trained already. She loves to go outside but she doesn’t play. She just wants to lay by my feet , she wants to be in the chair with me or her kennel very rarely barks or makes any fuss. I looked her up on a dog identifier app and it said she was 65% staff sure bull terrier and 39%. I think American pitbull I would like confirmation and also if anybody could tell me about how old she is, she still has puppy teeth, but I can’t tell if she’s younger than three months or three months .

Based on her behavior and the fact that she still has puppy teeth, she’s likely around 2-3 months old. While the dog identifier apps can give you an idea of her breed, a vet visit or a DNA test would provide a more accurate confirmation.