A person who loves herself excessively and is excessively preoccupied with herself is often referred to as a "narcissist." Narcissism is a personality trait characterized by a grandiose sense of self-importance, a constant need for admiration, and a lack of empathy for others. It can be considered a negative trait when it leads to self-centered and self-serving behavior, negatively impacting relationships and interactions with others.
It's important to note that self-love and self-care are essential for a healthy sense of self and well-being, but when it becomes excessive and at the expense of others, it can be problematic. So, while self-love is generally considered positive, narcissism, which is an extreme form of self-love, can be harmful.