I won't tell you to absolutely not do that since only you are there with her, and you believe it helps her breathe better. If you followed advice to not hold her upside down and she dies, you will be left wondering if she would have lived longer if you had continued to do so. Since her comb has grown more purple, she's clearly not doing well anyway. (I'm sorry.) But here is info that explains why holding a chicken upside down is not a good idea.Hi, thanks for checking in. I'm still having to hold her upside down to regulate her breathing and make her more comfortable,
https://www.thefeatherbrain.com/blog/holding-a-chicken-upside-down
I haven't ever used VetRx so have no input there. Maybe someone who has used it and had success will reply.