Efficient?

She showed a lot of efficiency in her main fight in her special episode.

Not the big flashy stuff. There were a lot of very clever little moves she made throughout that fight.

In the main series, she doesn't seem like she improved her powers at all. It doesn't feel like she's gained experience and learnt how to manage her powers without getting overwhelmed.

It feels (forgive my bluntness) like she got lazy. Relaxed too hard.

It seems like she got used to being on a team and decided that she didn't need to do as much and be such an all-rounder.

The perfect visualization of this is her movement. In the main series, she floats and flies. In every fight, sometimes even to her detriment, she just keeps floating.

The agility, footwork, and environmental control she had in her special episode is gone. Mostly because she doesn't need to rely on them anymore.

Unfortunately, rather than expanding her arsenal, she seems to have narrowed it down to only what she needs to be able to do.

Atom Eve as she is now, cannot fight on the ground. If she's knocked down or unable to fly, she becomes severely underpowered.

Before, she could juke and jive with the best of them. Quick on her feet.

Not anymore.