How can you call yourself her mother??

During our foster care training, one of my new friends...such an awesome woman, Christie was talking to us as an experienced 14 yr foster care mother. I think she said she has had over 100 babies come through her home....I may be overestimating that...but I know it is a lot. Anyway, she was talking about her current foster daughter, and referred to herself as her mother. And one of the women in our class asked her, how could she use the term mother when talking about her....knowing in her heart that she isn't her "real" mother b/c she has a mother. And I LOVE what Christie said to her so kindly and gently. She said, b/c in my heart, for as long as I have that child, I am her mother. That child may be with us for just a short time, but how could I show them the love, support and security that they NEED, if I didn't think of myself as their mother, and love them as much as I could my own? She is so right. I think to go into this with reserve, or holding back emotion to protect myself, I wouldn't be giving the child what they need. It is not my place to hold back knowing I very well will be giving this child back, but it is my place to give that child as much love as I possibly can. I may be the most stable thing they ever have in their life. (I hope that is not the case....b/c I aint too stable some times! haha) She has been an awesome mentor to me, and such an inspiration to see what she has done. She started fostering whenever some of her 4 children were younger than my own, and now her oldest just graduated high school. And she is still at it. They just adopted their first child that came to them as a foster child....and she has taken care of so many babies. She does so much....I wish I had the dedication, strength, and energy that she has.