Two friends too many

When Peanut moved to town, she had to leave her best friend, Regan, behind. Then Peanut and Jilly became best friends. But Peanut didn't forget Regan. Now Regan has come to visit Peanut. Peanut and Regan are having a great time-so great that Jilly feels left out. And Peanut doesn't even notice how bad Jilly feels. Then Jilly's cat gets lost. Jilly needs Peanut's help! But can Jilly forgive her once-upon-a-time best friend?