Best friends

Martha plans to visit her best friend, Anne, who lives in Paris. They are have been friends since they were in elementary school, in fact, Anne was the first girl Martha met when she moved to Lyon.
Martha was born in Madrid, but her parents decided to move to Lyon when she was five years old.
She remembers almost nothing of her life in Madrid because she was small [quite young], but her mother told her about her first day at school in Lyon. She did not speak French, and she was very scared, but when Anne saw her she came over and smiled at her. at In that moment Martha realized that everything would be fine and she felt much better.
Now Anne is about to have her first child and asked Martha to come to Paris and be with her. Anna decided some time ago to be a single mother and Martha has always supported her in her [this] decision.

Very well written, Francesca!  Only some minor changes and a couple of alternate suggestions in [], but otherwise it's perfect.