* Anne's love of beauty and her focus on appearances: Anne's passion for beautiful things, her dramatic flair, and her tendency to focus on her own appearance rubbed Marilla the wrong way. Marilla, a practical woman with a focus on hard work and practicality, saw Anne's fascination with pretty things as frivolous and superficial.
* Anne's tendency to be dramatic: Anne's theatricality and tendency to exaggerate her emotions (like when she was "dying" after breaking her hat) made Marilla think Anne was self-centered and overly concerned with herself.
* Anne's initial tendency to be bossy: Anne, especially in the beginning, had a habit of ordering people around and dictating how things should be done. This, combined with her love of attention, made Marilla question whether Anne's focus was truly on others or just on herself.
* Marilla's own upbringing and values: Marilla, having grown up in a time when women were expected to be modest and practical, found Anne's flamboyant personality and interest in beauty to be a departure from what she considered proper behavior.
It's important to note that, as the story progresses, Marilla realizes that Anne's vanity is not malicious or selfish, but rather a part of her enthusiastic and passionate nature. Marilla learns to appreciate Anne's unique qualities and recognize that her love of beauty and her dramatic flair don't necessarily equate to vanity.