Sorry, but do not think Tara is making this up or using Russians as the target group. Why would she want to put Eteri and her group on the defensive? Tara and Johnny are usually pretty supportive of the Russian ladies. This is not being said about a US group because the top US skaters who compete against each other don't generally train together. The idea that Tara would want to start something makes no sense to me. I think it is more likely there is a problem between the girls and Eteri said more than she should have, possible because she was annoyed at the moment.
Yulia seems to have a great relationship with the other Russian skaters, like Liza and Lena, but she is not training with them. It has to be somewhat difficult for her to be going through the transition that she is going through while training with the next big on the rise skater who is now her competitor. If these two young ladies are having problems it does not make them bad or spoiled, it makes them human. Heck, sometimes people just don't like each other. Maybe Yulia finds Evgenia to be annoying, who knows. Not that big a deal IMO. They don't have to like each other.
The larger problem is Eteri needs to keep family business in the family. She should not have put any information about this on the street and she likely regrets it now.