Search Results: crying over a break up

She's always been slightly different but seems to get along with everyone overall. Things I'm noticing that's making me question her (she just turned 19 last month):

- She just broke up with her long-term boyfriend and the following day was partying. She blocked him and claims to have already gotten over him.
- She hardly ever cries during funerals, even when our grandma passed away last year.
- She cheated on a boyfriend once and claims to not understand at all why cheating is a big deal nor why people get so ''worked up'' about it. In private she admitted to me that she really felt no guilt nor remorse for cheating.
- She always seems excessively happy (too much) and rarely ever gets upset.
- Her self-esteem is over the top. She likes talking about herself and achievements so much. Sometimes it's excessive. I understand you gotta love yourself but her way is too much.
- She always made friends easily as a kid and had no issues finding new ones if she had a big fallout. She treated them the same as her recent break-up, didn't miss them either.
- She once said to me ''I'll get someone rich one day. I always get what I want.''

My parents and others just think she's special and can get over break-ups so fast. I think not. Is there something wrong with my sister? Is she a normal person?