Charlie and Lola (2005)

S2E4 This Is Actually My Party

Charlie throws a monster-themed birthday party and invites his friends, including Lola, who isn't thrilled about the theme. Eager to assist but going overboard, she opens Charlie's birthday cards without permission and makes some unauthorized decorative changes. When she changes the music during the party games, Charlie reaches his breaking point. However, Lola discovers a unique way to lend her support and make the celebration enjoyable.