Medivh - No chance
Original Gul'dan - Probably
Archimonde - No but she might at least be "near" him
Kel'thuzad - Yes
Illidan BC - Maybe. I say this because Arthas was able to defeat him while severely weakened. Unless illidan gained more power when he went to Outland.
Arthas - I think this is the best analogue of where she sits in power. I feel like they would be pretty even if not even a little ahead or behind him.
Deathwing - In terms of raw power no. I don't think many people are though. I think she could still beat him by outsmarting him though.
Lei Shen - Unsure. Still not sure his entire scope of his power but doubt it.
Garrosh - Easily
Kil'jaeden - Similar to Archimonde probably not. He's not known to be as powerful but he was said to be smarter. I feel like he could outsmart her and win.
Argus - No chance. We only beat him because the Titans were there to save our asses.
Azshara - Probably not but we don't know either of their full powers. We just know Azshara is supposed to be god tier basically.
N'zoth - No chance.