What i would try:
bounces 2
IC at 40-50 at the most. It is not a very-very complicated scene, no hard borders. Could even decend to 20-30 for a start.
IQ at 50 and see what happens.
Pixel samples at 3
Min shadow rate at 0.2 to 0.5

And start fine tuning from here.

Just an obsevation; is the cloth "in" the floor next to her left hand?

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!