I really like the beginning of this story. The detail, for example the reference to the white tiles, seems somehow to contribute to the atmosphere. And I really like the suddenness of how she wants to burn the place to the ground. It seems to contrast with the tone of the previous lines and indicates how her feelings about everything have changed.
One line is simply "want my boy." I wonder is there an "I" missing from the beginning of that sentence.
You've written "lullaby's" when it should be "lullabies" and "sleepless nice."
I really like the way she talks about wanting even the more difficult and less pleasant parts of motherhood. It makes sense.
And I really like the imagery of the dead child. It is stark and draws our attention to just how horrible the experience of losing a child is.
I think Luna was an interesting choice for a story like this. I like the way you link her sadness at losing her child with her sadness at losing her mother.
This is a really good story. You've captured her sense of grief and loss so well.