I have a friend,she underestimates herself for not being gud luking.i need some suggestion ,pls do read this.?

she is 16 year old girl.she is fat and dark,she has a hole in her chin.her face looks like a guy,she told me herself and that's what people tease her for.she has no friend except me because she is perfectly wierd and ugly.but i think she ain"t too bad.she doesn't like people around her being involved in love,bf,gf and stuff like that that makes her jealous.everyone in family keeps teasing her and make fun of her.they compare her with her brother who is just 12.she always keep on telling me that people laugh on her because of her appearance and everytime she thinks of think of this she feels like to kill herself.i need you guys to suggest me what to do.think about it.