She was heading to St. Mungo’s to help her with her sickness when, on the way there, she was still in a muggle world, a muggle van pulled up in front of her and said,

Why don’t I take you on a drive around the city?

Hermione was a good woman, and knew all about strangers. She was NOT just going to let herself get kidnapped. She responded with,

Sorry, my parents are waiting for me a couple hours away.