Though I don't have a full ref,
here is a good ref for her background colors and her cutie mark. Up close, her cutie mark looks like
this up close, but in navy. Three of
these one each temple, upright and in a horizontal line outwards, the one closest to her eye being the biggest and the one furthest as the smallest.
This and
this are alternate references for her, but are not complete.
XD Still trying to get a good pic of my MLP OC.