Elsa was going to wreck this, that's all that ran through Anna's mind as she stood by and watched Elsa trade petty jabs with Hans. Where was this jealousy coming from? It wasn't like Elsa, not the Elsa she knew, anyway. Hans calling her 'babe' was a bit unexpected, but Anna saw it as a compliment, it was about her appearance, right? So clearly it was more than just Elsa who saw how grown up Anna was. Grown up enough to handle other people. Grown up enough to handle guys.

"Elsa!" Anna said, raising her voice slightly, "That's rude. There's no need to be so..so petty! Hans has been nothing but polite, a total gentleman. You're being rude, Elsa!" 

Anna placed her hands on her hips, almost shouting at her sister. It was evident that Anna was unhappy, and that most of it was due to Elsa's interference.