perhaps she found a love interest and doesn't want old feelings to resurface
Maybe it is because you haven't spoken to her for some time. Women are fickle. Give her some space and then she will probably come to you and chew you out over whatever it is that is bothering her and you can move forward.
She can't cope with something, I don't know what. You will have to let go of it.
maybe she is bi-poler or has some other sht going on
She's probably angry at you for something you did. I feel the same way about my ex - I don't want him near me or else he'll get a blow to the face!
My GF (not even XGF !!) kinda did that this week..Everything was awesome,.even when she went on holidays and we were e-mail all the time..
The sudden switch-off may be for some fickle reason,.but that still does not help much in dealing with it..
So at least you know it can happen to anyone at any time..
It would definitely be noted by any psychologist in an evaluative sense.
Therefore its not to be taken too personally.
However we still need to process it and get beyond it somehow..
For me,.well i will just wait and see..Its been a week with no e-mail.
I can relish the memories,..ponder the shutdown,..and embrace whatever the future brings,..one day at a time.