Alrighty then, I can give you some of my views on Ankhesenamun, but not all of it comes from anything that has to do with the "past life". Most of my views are theories concluded from the archeological evidence, although sometimes I feel more "connected" to a specific theory, as though it was what had really happened.
I believe that after the death of Tutankhamun, she made Ay co-regent. The ring they found bearing their names does not have to signify marrige, which by the way, the ring being synonymous with marrige is a purely western concept. And seeing as Ay is closest thing to family, or according to some varriations, the grandfather/uncle of Ankhesenamun, which in that case makes him imediate family, she would trust him most out of all the other members of the court.
However, posssibly an event made her distrust everyone in her court including Ay, if she indeed wrote the Amarna letters. There is strong evidence supporting this because, not only did Akhenaten have a sucessor (thus providing no need for a foreign prince), the letters were signed Dahamazu(sp?), which in ancient egyptian would be Hemwet Nesew-Kings Wife. Nefertiti was know to sign documents using the name Neferneferure, or using a fuller title. So if Ankhesenamun wrote to Egypts enemy the Hitites for help then the cause must be some sort of conflict in the court. Maybe she found out that Ay murdered Tut? or Horemheb, Ay's chosen sucessor did? or they both were in on it. Or it could be conflit of interest and there was dissagreement on who should be so qualified to be the next pharaoh.
As for her "dissaperance", the theories are, she died or was murdered/ committed suicide, or ran away and lived in obscurity. Logic would tell me to lean toward suicide, or murder as most theological monarchial society rulers believe themselves to be ordaned by the gods, ruler until their dying day, and would not easily give up the rulership by leaving it. But this is where the whole "past life" thing slightly comes into my theory. Logically ,she would most likely died in one way or another, but I don't feel that she died violently or by a malicious intent. Suicide or euthanasia would be a more likely possibility in my eyes. Or, she did run away and live in obscurity. There are theories out there that connect her with a royal lady of Seti I's court, a women named Sitre-trans: Daughter of Ra. Maybe she stayed in the court but played a behind the shadows role? or retired to another palace.
Anyways, I don't want to be too specific, as that would cross the border of speculation, and possibly go into fiction. I hope some of my views are helpful in your research. It may not be reliable, but some of the directions I've taken the evidence may interest you.