I just watched that some time ago, and I gotta say I feel really sorry for Lena. I heard this happens/happened often?
Apparantly it was because she hadn't been eating enough because of all the stress... And then there was that diet-thing (which I'm not sure is a rumor or not). I think it was really sweet of Yulia to help, but I also think that it was sweet of everyone who was there to help her aswell. Although, if I was her, I wouldn't want that to be recorded.. but it still gives us a peek into the world of Tatu.