Hello, my apology for having no replies, sometimes this can happen when the site is busy, but this will bump your thread back to page 1.
It's so sad when a friend gets depression, unfortunately, it's so difficult to stop the avalanche of it coming, especially when it's the first time or perhaps when therapy hasn't been engaged.
If your friend is suffering then what's being said may just bounce off her, in other words, she may not know what's happening and what's being told amongst her friends, but what she will pay attention to is the trust you have for her, and most likely this dishonest friend will eventually fade away.
Your friend will want to confide in with someone and if you can stay by her side then that's all the trust she needs.
Whether she wants to be friends with 'both of them' she will decide by herself as their true colours will come through, in other words, know whether they are trusted or not.
Try and stay to be focused because only someone who is like this will only be able to be trustworthy.
If you feel the need it would be good to see your doctor for extra support, but please keep in touch with us.