Someone Help My puppy

She's a pit bull and she has had her first parvo shot out of the 3 or 4 there is. Shes2 1/2 months. She rarely ever goes outside. She has been chewing my moms shoe boxes which are cardboard. She threw up today 5-6 times in 30 minutes then she ate and was fine until several hours later she threw up twice again. Please help I hope it's not parvo. Also her poop has been normal until after the last time she throw up it was still solid just a little squish and runny. Please help