Maybe a constant light source like LED torch or LumeCube would be easier for her to handle.
Wondering too if you needed flash, but I'm unsure what your intentions were. I took a screen dump and played with highlights and shadows a bit, increased contrast a smidgin, plus reduced the cyans and a couple of other very minor colour tweaks, but still leaving an acceptably darker "layer" where her body contacts the mat. I'm not deriding your choice of flash (or anyone else's), but I am thinking your PP skills are ample to avoid flash in this instance. Just my 2c