Ms. Mabel is a Basset Hound just full of regret.
But as you can see, she was very sorry:
"Ms. Schmitt ~ My mom hid this from me, but I can smell a Pulitzer Prize winner from a mile away. Frankly, I found the ending to be quite disappointing (as you can see). I did all future readers a favor. My mom says it's coming out of my allowance. (I was saving for a new collar).
I'm sorry,
Ms. Mabel"
Don't fret, Ms. Mabel! No one can stay mad at such a cute dog for long.