Translation of rüsten

I hope you could understand my last letter to you. You see, when I write in Spanish I am not very confident. I always question myself and each and every sentence takes about fifteen minutes.
In the following pages I would like to talk about a topic which should concern everyone of us. It is a delicate topic which has been present as long as human beings have existed and it will last forever.
She started to walk with us and one could observe that she had lost some of the naivity many children have, due to the fact that she started to be a sales person long before she reached twelve.