I say, half-joking, "Well, you know where I live so you can just drop it off sometime." (I live in town and not too far from this student).
She says "Okay -maybe I will."
Yesterday she emails me to see if someone will be home today so she can drop it off.
This afternoon, my parents and I go out for a walk and this student happens to be driving to my house to drop off the gift. Seeing me, she stops, jumps out and hands me a gift. Then she jumps back in her car and drives off.
Hours later, Isabelle comes home and sees my unwrapped gift:

"Hey, where did this cool book come from?"
Before I can explain, my Mom pipes up, "When your Dad walks around town, people just stop their cars and give him gifts in the middle of the street."
I pause for a second and then say, "Yes, that's exactly correct."