What about her pearl? Every fuzanglong myth I've found says that she clutches a divine pearl, her most precious treasure.
I was doing research because I wanted to put a fuzanglong girl in a story (that takes place outside the MGE universe) and ran across this. Interesting direction you've taken her! Do you have any sources for all her lava theming, or are you just taking the reports that volcanoes erupt when she reports back to the heavens and running with it, extrapolating all the stuff about directing underground magma currents? TBH, it's really hard finding mythologically accurate information on the fuzhanglong. :/