Dancer at night

So, I shot this yesterday. This was my first time doing something like this. Any CC is greatly appreciated.
It was pretty dark out, so I had her light herself with my phone so I could focus manually then time the jump. D700 50mm at ƒ/2.5 1/160 sec at ISO 2500. Speedlight was at 1/8th power about 15 feet behind her.