Dog Biting?

Hello everyone,
My rescue is now approaching six months, and we almost had a problem yesterday. My younger cousins tried to pet my dog, but she snapped at her. Caramel almost bit her, and I'm afraid she would've drawn blood. She is not hand-shy to me or my family members, but seem to be scared or nervous around little kids. She also seems to be a little nervous of older people, but tolerates them. I got her at about 5 months old, and tried to socialize, but the COVID-19 pandemic got in my way. Please let me know if you have any tips! I live in a pretty lonely neighborhood where there isn't a lot of diversity of people.