Blone Kidnapping

There was a blonde woman who was having financial troubles, so she decided¹ to kidnap a child and demand a ransom². She went to a local park, grabbed a little boy, took him behind a tree and wrote this note:

I have kidnapped your child. Leave $10,000 in a plain brown bag
behind the big oak tree in the park tomorrow by 7 AM.

Signed - "The Blonde"

She pinned the note inside the boy's jacket and told him to go straight home.
The next morning, she returned to the park to find the $10,000 in
a brown bag, behind the big oak tree, just as she had instructed. Also
inside the bag was the following note:

"Here is your money. I cannot believe that one blonde would do
this to another."