A wishing well

Please tell us a tale.

One night, Papa mouse tell mouse boys seven tales to make them sleep. I am going to introduce one tale of them.
A mouse found a wishing well. She thought the wishing well make all her wishes come true so she threw a penny into the well and made a wish. "OUCH" said the well as if it hurt. Every day, she came there and threw a penny but it said "OUCH".
Then, she thought seriously a way not to hurt the well.
At last, her all wishes came true, thanked to her pillow.

How did she use the pillow and her wishes come true?