Board Thread:New on Ben 10 Wiki/@comment-82.46.142.194-20130524094327/@comment-8505655-20130528015209

For one, she had barely met him, and he had not yet turned in Bullfrag. There's debate as to whether she actually cares about him outside of the Bullfrag persona, with some arguing that any affection she shows to human Ben is simply directed at Bullfrag.

On top of that, Attea is - by virtue of a faster aging rate than humans - more or less a teenager and Ben's age in Omniverse, whereas she was a child in Alien Force.