As she is part normal type, Rin doesn't have major mutations from her Enlightened abilities. The only mutation she has is the strange ring and spiral design forming around her fingers at start and the more she grows in levels, the more the design wraps around her hands. There is no major symbolism as far as she knows, but she will just have to train more to see what happens to them in the future...
At her final evolution, the markings will glow depending on certain moves and she is skilled in strength, speed, and accuracy at this point. She will sometimes wrap her hands in bandages as a precaution.