Nope. AJ is still there, nothing happened to her.

[quote=Yog Sothoth]
does else find it weird how Slytherins are associated with potions when the main characteristics of the house is about ambition and wanting to be great? I find that in the wizarding world, wizards and witches who fight dark wizards or are dark wizards themselves are the most famous of magic users. so to me it seems like other types of magic would fit the house instead of potions
[/quote]

Nope. Potions are actually fairly powerful if used correctly.