Abigail's two power's are connected and are the result of the same thing: an entity that bound itself to her. The first of her two power's allows her to siphon energy from other living things. The person on the other end of this power may initially feel lightheaded, slightly woozy, and might have their balance affected. After these initial side effects pass, they will feel tired (at least in comparison to before Abigail used her power on them). As for plants, they will wilt and may even die. It's unknown how much energy she can take from someone, though she does seem to get sick if she takes too much (basically, her body can't handle an overflow of energy). Her second power is basically a more extreme version of this and it actually involves the entity emerging from her body. Specifically, her corpse, as this ability only activates after her death (though, only if her death is caused by unnatural forces (ex. murder) (also, self-offing isn’t considered “unnatural” by her ability)). The entity, upon emerging, will search for the nearest life (it typically will only go after animals and not plants) and take all of its “life energy”. After it gathers this, it will return to Abigail’s corpse and essentially revive her. If /it/ gathers too much life energy, however, it may cause her body to de-age slightly. Another side effect of revival is her losing a chunk of her memory (from a day up to a year); however, she seems to retain a sense of how old she is (physically), how old she’s supposed to be (without the revival/mentally(?)), and how much of her memory is missing. Anyways, as I (probably) mentioned before, she has little to no control over her powers (ex. she almost never uses either power on purpose and her ability /literally killed half her family/), they come with some negative side effects (ex. the "energy poisoning” and memory loss), and she doesn’t even really know about one of her abilities (her second power- this is because she’s dead whenever it activates and she always forgets the fact that she even died)
her outfit isn’t really her normal outfit (well, the slippers are and the arm things are but yeah)- I got lazy and kinda just wanted to show off her hair :D