I don't think we'll know anything more about her health. Zhenya and her team have the habit of hiding everything unless it's very grave. Only Averbutt spills things sometimes but he always drama x 10 so don't know to which extent we should trust him.
I think even if she has some problems, she would attend worlds anyway because it's the last comp of the season and it's the most important comp behind olympics. And we'll know nothing about her condition (unless it's very very serious) before or even after Worlds (because off season starts so she has time to recover so they'll not say anything).