there is a nerve (I imagine it as a powerful floating nerve) that runs through the whole imagination of the different ways that motherhood takes on and that keeps running continuously.
Every mother recognizes in herself this sensation as she reads the line. More than that, people who haven't been mothers can achieve a better understanding of motherhood as a life-altering state. The 'nerve' you write about is undeniable, and unshakable. It lasts a lifetime. The power of it may ebb and flow, depending on the need of the child, but the nerve is there as long as the mother lives.
The magic of your piece is that you capture the sense of an unbreakable, undeniable bond. The incident at the window of your daughter's school perfectly shows that the connection, and emotional need, may be as strong for the mother as for the child.
This is beautifully told, @gracielaacevedo. It is of course specific to your family, but it is universal. The value of any story is what the reader takes from it, how it affects the reader. This story is very effective. It was a pleasure to read.