She could just be a musician. Geisha don't soully play Shamisen, it's just a skill they require for entertainment.
Besides that, her hair is inappropriately styled. The modern times are more lenient than the past, because back then they didn't have wigs like today, so their hair was constantly up (Hence the reason why they had to sleep on elevated planks to keep their hair from messing up. THey would only get their hair styled every 1-2 weeks.)