Both the Poinsettia and Chile's behavior.

Although Bailey and Bella will often stand up on their hind legs to see better, Chile normally doesn't. However, Chile was utterly fascinated by the poinsettia. For some reason, she wanted to smell the top of the plant; which she could barely see from the ground.

Because she has a bigger head and fuller chest than the other two girls, Chile is a bit "top heavy" and has more trouble balancing on two legs than Bailey https://pbase.com/britestar/image/169939473 or Bella https://pbase.com/britestar/image/169721922.
However, Chile has obviously learned to do it; by example.

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A Moment-in-Time "Memory Shot"