I have been reading this and keeping up to date as it all goes on. I think we are all giving you advice based on our experiences and want to offer you support in this difficult time. If our advice does not feel right, then you should evaluate it and decide for yourself if you should follow our path as offered to you.
You offer some good points in your last posts that are valid and show good character that you question in search of the truth (not to just be oppositional). I think you are valid in wanting her back in your life. I would caution you that you can not go back. There is a reason she left and if you two have not identified that reason, worked on it, confronted it, and laid it to rest, history is likely to repeat itself.
So if you do not build up this "wall" with which to protect yourself (which I must admit is good advice in 99% of all cases such as this) at least demand from her answers and seek resolutions to what has happened. Do not ignore it, accept it, or allow it to happen again. Be an active part in any relationship.
But as you have stated she does not seem to be grieving. Maybe this latest contact is her way of grieving. Should you be a part of it? I don't know... but becareful you are not her doormat while she does this.