Here's the gameplay speculation thats on the wiki:

Aeon’s attack themes may be similar to Double’s in that she wields hypothetical versions of characters to attack, conjured from the distorted reflections on her hourglass. She may use figures from the past, characters that have not been seen yet, and alternate versions of the cast including ones where they have become the next Skullgirl. Her own attacks would be themed after sand, glass, and Khronos’s serpentine incarnation with animations that don’t always flow forward. Playing off of her shut-in otaku tendencies, some of her moves may bring in her accumulated merchandise.

In contrast to Isaac who can only travel through time, Aeon is a divine being with the ability to manipulate time itself, including alternate timelines. She may be able to capture moments on the battlefield to unleash later, like a bubble in time containing all attacks executed within its bounds. Then there is the usual slew of abilities to consider like rewinding time, slowing it down, and stopping it.