What a cutie! Have you contacted the artist (if possible)?
For a self-fix, You could cover the hair and feather for protection. Gently wipe your girl down with a damp cloth to remove as much of the dust stuck to her as possible (spot test on a hoof first). Testor's Dullcote is a matte finish spray sealant that is wonderful. It's about $5ish for a small can and can be bought online or at a craft store. The can requires a good shake and good ventilation. It dries fairly quickly, and two coats should do the trick. It can drip if sprayed too closely or too thickly.
Hope this helps!