i could be wrong but i think those are research papers and the x's are where she realized she had goten something wrong herself, shes trying to figure something out and is repeatedly failing at it, where as twilight is aparantly sucseeding at everything she puts her hoves to without any effort...hense the shadow and hense the frustration
it provides a nice secondary reason for moon dancers annoyance with twilight later on
i could be wrong but i think those are research papers and the x's are where she realized she had go