(She wasn't controlling him, she basically gave him a hint)
As soon as he did that, the hell hounds dragged Markos spirit and soul to hell... and the souls of his victims tormented him as well... she could bring him back easily but she wouldn't. "I didn't know he wanted you dead Damon," she said, "If i had I wouldn't have helped him, I don't know Vamperisim but I did spare you from aging to death, in a few months... you can live a normal life, just remember you are not immortal... but, I may have messed up in my spell tripling tour lifespans, and longevity... I am sorry..."