Hi, 

I apologized in advance if I do come off a bit ignorant as this is very new to me. 

So, my (29/F) girlfriend’s (27/F) niece (24/F) has been baker acted before and she seems like she may possibly be bipolar, not sure. I have only hung out with her three times. My girlfriend’s family took her in because her niece’s mom would have put her in a mental hospital, so they wanted to see if they are able to help as she needs to be watched over 24/7 by someone.

Out of the three times that I hung out with her, she seems extremely inconsiderate and uses her tears and temper tantrum to get her way when people do not give her what she wants. She is medicated. 

My girlfriend and her family are way too nice to go against any of her request or just too tired to deal with the temper tantrum that will follow after refusing.

I told my girlfriend and her mom that her niece needs professional help and that they can’t say yes to everything because they fear she is going to throw a fit. I think that may be reinforcing negative behavior and setting her back

In my opinion, she seems to come off narcissistic and a manipulator. I don’t think because you have a mental illness that justifies you being an asshole. Am I wrong to think this way?

Again, sorry I do not mean to come off being inconsiderate and ignorant.