чувство языка/feel for language

[Olga]

Would you tell your best friend that they are “thin”, “slim”, “skinny”, “emaciated’?

[Марина]

Yes, I tell my friend that she is rather slim (or slim enough????), because she sits on Кремлевская diet. I think she is thin, and she should not sit on this harmful diet. But she ignores my advices.

[Olga]

just say advice

Noun "advice" is never used in plural.