I personally like the concept. Before I would approve her, and admittedly I would, I'd request a slightly more detailed idea of how powerful her "nearly-impossible-to-break" thread is. For instance, is it just tough because its empowered by necrotic magic? If so, there is no basis or relation to necromancy in this roleplay yet so I'd have to ask miss Cinderella some questions. You're basically creating, from what I've see, the first use of necromancy in the roleplay, so this is a great opportunity. However, I'd like to establish the weaknesses and strengths of necromancy. For instance, could angelic light purify it? Is it considered unholy or unnatural? Or, is it just another form of magic performing yet another otherwise impossible feat? In any case, is the necromancy any stronger than regular necromancy? For instance, could someone burn through it or fry it? 

A lot of that can really be overlooked and most likely created later; I would just like what your personal input and desires for the character and magical parameters to be.

Secondly, I think the dolls are really cool! But, I'd like to know where they came from. Did she make them? Does she have the power to do that kind'a stuff? If so, cool! List it. If not, did she meet them somehow? Or, were they created with her? Oh, and the last thing was to what degree of control could the Soul Threads perform? Could they like, bam, control anyone in the circus? I'm just wondering. For instance, could she be like, Bam, Soul Thread on Malignitas, and thus help Antoine control his desires? Or, does she have an actual limit? If so, is the limit based on raw power, or would the limit be based on willpower, such as that of the pure hatred and malice found within Malignitas.

For the most part, I love the character and I'd say she's acceptable. I'd just like a wee bit more information.