to be honest I always saw these two as being jerks / b**ches rather than outright villains - they seem like the spoilt little girls from high school or similar who are first to develop and thus make fun of others (I mean "Cutie Mark" is kind of a symbolism for growing up - especially in the new series).
They are dislikable for sure but compared to Discord or the monsters that inhabit the outer stretches of Equestria I wouldn't say they are an actual threat to the main cast (even Gilda qualified more, due to her being outright aggressive (and a thief to boot) ) Smiletime 14:35, February 13, 2012 (UTC)
Should we put her under the "Redeemed Villains" category? Coz she is the first to applaud Granny Smith's story, and if you notice she's not involved in Diamond Tiara's plan at all in Ponyville Confidential. Ghostkaiba297 (talk) 04:44, October 31, 2012 (UTC)