It's rude to make someone feel insecure about their weight.
Bella is spending time with her friend who has been depressed lately.
Bella wants to get her friend out of her funk.
Bella has a nice long discussion with her friend and encourages her to talk through her current problems while listening.
Bella tries to motivate her friend by pointing out that she has put on weight from being so depressed and doesn’t look especially good.
Bella's friend is able to vent a little by actually describing her problems aloud and makes the first small step to feeling better.
Bella's friend is in no condition to hear the blunt truth and becomes even more depressed and self concious.