Board Thread:Theories and Speculation/@comment-45986362-20200731113944/@comment-45444155-20200731132159

We don't know. We can assume it comes from the Senju clan. But it's highly unlikely. Although... Her name "モエギ" can be translated as "yellowish green - 萌葱", "Young trees - 萌木" or "Burning tree - 燃木". It all goes to Wood Release.

It's my option: Katasuke used Wood Release against Momoshiki with Shinobi Gauntlet in the novelisation of the eleventh film. Moegi's age, Konohamaru repeatedly used Shinobi Gauntlet. Perhaps Moegi also did, hence her Wood Release technique.