hey girl,
I agree , I think it's perfectly fine to give advice to the stylist if she ask for opinions and help on a client, but if another stylist client asked my opinion I would tell her that she was in great hands with her stylist and build her stylist up so that she would have confidence in her stylist.
The only problem I can see coming out of another stylist client asking your advice is she might think that you are more capable than the one doing her hair and want to switch over to you. and I know that's not your intent at all, but it does happen sometimes.
wow girl, one thing I don't miss in the salon that's drama, I feel for you. I'll be saying a prayer for you that it all works out with you and management. Keep your chin up and remeber everything in life is a test and how we responed to those tests makes all the difference.