I'd say 7 stops her with a tough fight. There are several before Wonder Woman who could give her trouble h2h but if Supergirl uses all of her powers then she should win those.
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Carl - "No, the real point is: I don't give a damn."
Carl - "This line, here? Line of Death. You cross it, and your freedoms no longer exist. Um-kay? Have a good day."
I would think that Supergirl take the majority given her speed advantage and the fact that Rogue may not be as experienced at using her powers as the individuals she gets them from.
But Sage enhanced Rogue would be one of her tougher opponents until she gets to Wonder Woman.
Hey that list of absorbtion is missing Vargas... I think I may have made a mistake by putting rogue so low on the totem pole... I mean with all of the abilities that she can bring to the table at will, i think that she may be able to beat Supergirl... after all she would be able to access Captain Americas fighting ability while having Gladitors strength and Silver Surfers cosmic ability coupled with the Hulks healing factor and.......etc..... lol I can't see her beating rogue, is that stupid or what?
Adam Hughes is the king of drawing comic book women.
Mary SHOULD be the equal of Captain Marvel but it's never portrayed that way. The old Supergirl (Danvers) stomped her easily. I'd put Mary in about the fifth tier of strength levels in DC where as Supergirl is in the second.