Originally Posted by Phoenix Lazarus:
“Do you think she's going to be brought back to play a part in the final two episodes? She seems too interesting to just drop, given it seems she has some sort of psychic powers but has been labelled as in need of 'medication'-indicating people believe her to have psychiatric problems. There is also an interesting back-story with regard to her sister going missing, for reasons as yet unexplained.”
The trauma of her sister disappearing, and the guilt she felt that this was somehow her fault, caused her connection with the 'aged entity' to manifest and enabled her ability to see the thoughts of others. Now that guilt has gone, and the entity has powered down due to the crisis being averted, she will return to being a normal little for her age girl. Presumably.