Charlie Churchmouse and Lessons from Miss Betty's Class

The toy's feel very threatened when they find that Miss Betty has not only made Chalky Kitty disappear from the chalkboard, but has also put two of their friends in a trash bag and left with them. Is Miss Betty really going to throw away Dump Truck Dewey just because his wheel fell off? Would she really get rid of Hugged -A-Bunch Bear, just because his arm fell off? Will they ever see Chalky Kitty again? Who are the three new kids Miss Betty made appear on the Chalkboard? Lastly, who will disappear next?