Is it the POA's job to inform the only living relatives of her conditions?

My cousin appointed her husband's niece, to be POA for my aunt (my mom's sister). Not sure why she appointed a non-family member, but so be it. She is not informing us of any health issues. She did text me and say she was moved to another facility, but did not state why. So I went in to see her and guessed she fell from the bruising on her face. My mother is worried about her 93 year old sister. The POA did tell us back in January that my aunt had cancer but she doesn't! That was a false statement, but they can't tell us anything via the HIPAA laws I guess.