Again.. I think you are missing the point and why dont you just anwser the question? I am not even saying that.. you say she believes this and that. But who is saying that? Not her.
Her speach in the cinematic was to get Illidan at her side.. when he refused she became.. not so friendly. Why did she wanted him to turn to the light so bad? To gain an ally? or does the light maybe has its own set of goals. We just dont know that(yet)
But saying he is healed because she said so is shortsighted imo.
like I said she was highly seductive and I said she is operating out of the light. Essentially I think she speaks for the light in a way.. she is not helping illidan.. persee more like her own goals or the light goals. Some one earlierwas suggesting that the light operates the same as the shadowlands and might have more then just one light source. Maybe there are two groups in that realm.. rebels fighting for full controll. The good ones/bad ones. Thinking way ahead of time here, but they could.. hear me out could potentially explain some realy big lore moments through this realm. I mean there is this whole debate going about the light helping tirion against the lich king. Why and how did the light do that? etc and that is just one example.
Edit: the guy I meant before is Lortraxion( the golden dreadlord) and I think with what we know about the dreadlords.. that he will turn against the light.. (if he can) someday. If its true that dreadlords can give in in any source off power and still be true to their leaders.. then its a matter of time before it happends.
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I hope the scarlets will get involved and that forshadowing is true. I think we deserve an explanation on the whole light wielding fanatics on why and what their true goal is. I am just not a fan of light and void lords. To me right now it sounds realy cheesy.. as in just another threat created to top the old gods or the Legion ffs.