I don´t know if we already have a thread about her.
But isn´t it strange, that´s she´s back to take care of the kids, after she said a couple of things which were against him 2 days before he "died"?
I mean if he is really dead, what I don´t think than this is against MJ wishes to take care for the kids.
But, I think she is there, cause to stay calm. Maybe if they did not tell her about the hoax she would open her mouth to the public and say that he might be still alive. Maybe I am wrong. But Mike fired her and she was not around during the last two years.
Another theory, maybe this was a part of the plan to leave him and come back after his "death". I don´t know I am so confused. It bothers me a lot that she´s there :( . This tells me that he might be dead. But then again, I think about all the clues...and I know he has to be alive.