Is my sister depressed?

For the past year, my little sis has been different. Here are some things:
- comments on being too fat
- general negativity
- lack of interest in family
- disconnected with family
- easily upset
- low self esteem

She seems so down all the time and its been a while since I've last seen her super happy. even today, on Christmas, she seemed down. My parents are willing to acknowledge that she might be depressed, but keep saying it's just a phase. But this has lasted for over a year. Ps. mental illness runs in my family and I myself am on meds. My parents are super supportive with me so they're not trying to hide my sister's possible condition. I just need advice. please help.
Is my sister depressed?
Add Opinion