The whole point of certain kinds of therapy is to ask for what you need, and to ask for what you want. From the feelings of asking, from the response, the feelings after the response, and possible exploration of said feelings came the safety and security I needed to move my life further along. Transference plays a big part without being mentioned. It's just done.

ETA: the adult rainbow8 knows that your therapist response makes sense and is perfectly logical. The adult you understands. The little you doesn't, because no one and nothing else should matter to her. Once that small part feels satisfied (it takes time) she will know it will always be there, and eventually the adult you will be able to give her the reassurance that is needed. Right now you are asking and getting it from your therapist and that's okay.

When a child has secure attachment, it doesn't mean that child's every need was met one hundred percent of the time, but most of the time.