Maya has the ability to teleport herself, or other normally movable objects. Both the object being teleported and the destination must be within line of sight. When an object is teleported, it leaves behind an empty space where it previously was, as a result, the surrounding material (if a distinct object is teleported out of a solid) is left with a hole, or the surrounding material must rush in to fill the vacuum (air or water). At the opposite end, the object when it reappears displaces what was previously there, essentially forcing anything already there to get out of the way. This "minor" detail makes her ability extremely dangerous. An (im)properly teleported sheet of paper could be used to sever body parts, or an object could be moved inside someone else's head, for example, with predictable results as the object forces its way in. The biggest limitation on Maya's ability, is the need for line of sight, meaning that blindfolding her (rather hard to do and keep on her) or making it too dark to see makes her ability extremely volatile. If Maya cannot see the destination or object, either A, the wrong object gets moved, or B, the right object ends up god knows where. Her definition of "line of sight" however, can extend to live video feeds, such as security cameras, live news reports, and video conferencing.As she's increasingly used her abilities more often, she's discovered there's the potential for her power to cause some truly absurd quantum weirdness, even having found herself at an entirely different world full of super powered people for some time. With quantum theory being quantum theory, this opens up a huge range of potential things which can go wrong if she doesn't exactly calculate her teleportation in all dimensions of space-time-possibility, meaning no shortcuts and only calculating for the normal 4, ranging from ending up in a completely different reality, to suddenly finding herself as aged suddenly in one way or another, to suddenly existing as an entity with more than just 3 spatial dimensions and time.
Essentially her ability, when "properly" used isn't actually all that game breaking, but due to the nature of how it works, it opens the door to the some truly weird shit if used improperly and without preparation.