The trumpet that Angel Kitty carries is a cross between a bugle and a French horn. It had the sounds and tune of the bugle and the bell of the French horn.
In the beginning Bonnie pushes Buzz and Jessie down a mountain on a sled, and 6 seconds later we see Jessie is covered in Styrofoam peanuts across the room. Jessie couldn't have gotten over there without Bonnie seeing her.