My guess is that your pretty little girl is a Black Sabino Tovero....and most likely carries LW.
As you know, I once owned her 1/2 brother (same dam) "LTDs Moonstruck" and she looks just like him. He tested out to be black/sabino/LWO. AND.....I noticed your little girl has a very small dark black spot in the middle of her roaned marking on her right hip. Moonstruck had the very same marking....in the same place!
Here he is as a foal with his dam, Moonlight....
And here after he came to live with me.....
And here he is as an adult, you can still see the very black spot on his right hip....
And here is the most recent photo I have of him, that his new owners in Australia sent to me.
This was taken in middle of summer when his color is usually the lightest. It gets much darker
and more intense in winter. But...you can still see that the little round spot on his right hip
is still darker than the rest of the color.
Your little girl is simply darling...and I love the name "Over the Moon".