To be fair, it doesn't have to be mind games, she could have been in a bad place and somehow figured out for herself that the best thing to do was to end the relationship, but realised that she was wrong. There are people who genuinely believe that they can make other peoples lives better by leaving them (a kind of "you would do better without me, I'm only pulling you down" mentality), that could do something like this not to manipulate the other person, but because they actually care about them, but are in a bad place themselves.