End the Heartlessness!

I'd say that you give you an event that really shakes up her character, or set her up with someone that will most likely change how she acts - the best type of development is a slow and steady development. All characters have a flaw, even if they're heartless/misanthrope/evil.


For example, Zentaal, my 'distant' character, also is not one to associate with people and is mean to all, preferring to be alone, but he has a flaw to get curious about false smiles and he - eventually - is okay with people that are persistent, depending on how they treat him and if he can take their general personality. Some of these flaws in his 'distant' trait allows him to gain a strict band of 'acquaintances' but kind of keep that reclusive personality.