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"She just loves Costco," Walker told Babble.
"She's pretty quirky, so it goes right along with her personality," she told InsideEdition.com.
The party featured guests decorating their own Costco membership cards, which they were then required to display in order to go on a mini shopping trip using "money" bearing Kimber's face to purchase Kirkland Signature -- Costco's house brand -- treats.
Walker said their local Costco got in on the action, supplying Kimber with an employee badge and a cake bearing the store's logo.
"The employees took pictures of the cake," Walker said. "They were really ecstatic to do it."
"We told them that she was going to have a Costco-themed birthday party and asked if they would print her ... an employee badge," Walker told TODAY.com. "She wore it the rest of the time there and pointed it out to all the employees."
Walker said the theme was a big hit with Kimber's friends.
"They thought it was hilarious and quirky, which both describe my daughter," she said. "One of the little girls that came said that it was the best party that she had ever been to, including all of her own."