Well, this one is more of a 'utility' one. She'll take a long time to even be able to do anything with it as books on space magic are super rare.
Once she does begin using it more, she first develop a space defense shield which is much stronger than the usual for elemental shields.
Then she gets to be able to 'extend' space magic around her, creating a space where she can set 'rules'. It's mostly usable against people her own rank or lower, but when it does work she can basically cut people's speed in half, increase gravity, and so on.
Then, she learns fancy stuff like Teleport and 'walk through walls'.
Sadly it seems she has forgotten a lot of what she can do, and the author is good at constantly saying 'her teleport improved' but giving the impression it got worse. One of her newer abilities that she in fact only used the once was basically "being able to decide if an enemy was near or far when within her space" (think: your attacks are always too far away from me to touch me, mine always touch you, etc) but it never happened again in like 700 chapters.
Oh, and she knows she should be able to actually go into her own space, but it's still a long term project.