"But her sister Vanilla is quite mean."
It's a simple statement, but it's important to note that the word "mean" can have a few different connotations depending on the context. It could mean:
* Unkind: Vanilla is not nice to others.
* Cruel: Vanilla enjoys inflicting pain or suffering on others.
* Unpleasant: Vanilla has a bad disposition or is difficult to be around.
To understand the exact meaning, you'd need more context. For example, what is the story about? Are Vanilla's actions being described?