Друзья how much do Ты talk about?

It depends on the idividual Друзья for me. There are two Друзья i have told everything and anything, knowing they will not judge me или dispise me and will be able to offer hope and support when i feel low when the memories hit me. Other friends, certain things for me are off limits and i respect their decision if they do not feel like telling me anything.
However - if your friend believes she should know everything about you, but does not respect Ты enough to tell Ты everything about her, then i can't see the relationship going anywhere.
Ты should tell your friend that Ты respect her decision not to tell Ты things, but she in turn should respect the same of you. If Ты do not want to tell her things, she shouldn't push at Ты или become huffy about it, as that is not what a friend is supposed to be.
It could be she justs wants to help, but all the same, she can easily sympathise and encourage and hold Ты up by the sidelines not knowing anything, then knowing every little detail.