SPOILER............................
Alia, in regards to the Lady of Battles killing Alain, I don't necessarily think that was the work of an enemy or an evil entity. I think it was all part of the master plan- not to mention, if he had never gone back in time like that, he never would have been able to experience true love.
Basically I think that we can't know whether she's helping or hindering him until we've turned the last page of the last book. But I'm not ready to dismiss her actions as evil just yet, even though they did result in his death.