She can stretch and fold space around her. It lets her do things such as make a room bigger on the inside or create pockets that can hold a lot more than they would appear to or even cross a long, enclosed distance in an instant by folding space.

However she is severely limited in that it tires her out to even alter a small area and the further away it is and the more significant the alteration the worse it becomes. She might expand the space within her clothing to carry knives in for example, but she wouldn't be able to maintain it for more than a few hours without becoming exhausted.