I'm reading the book now, and IMO the account of her first affair is tasteful (and not a surprise to readers of Winter Season). Anyone who knows the company of the period will know who he is, but the account is discreet enough and I think it's relevant to the part of the book that is about her development as a dancer and a person.
I don't see how she could not mention Petipa's violence toward his wife in an account of his life and career, as unpleasant as the topic is.
Otherwise, I'm really enjoying the book, skipping around a bit as well as reading in sequence. So far I'm not finding a lot of information that's new but some of it is, and I agree with vipa's comments overall. Surprised that in all the discussion of the ballerina parts, there seems to be no mention that Marie Jeanne once did all of them.