From last year, when she was five years old

 Let me advise you to form the habit of taking some of your solitude with you into society.  

Not to say what you think. 

Not to attach too precise a meaning to what others say. 

Not to expect too much of them. 

And to strengthen yourself in the feeling of indifference to their opinion.

This precaution will keep you from too close a contact with society, and therefore secure you against being contaminated or outraged by it.  

Schopenhauer