Car accident - advice

Hello,

I need an advice following car accident, hope somebody would be able to help.
Below is the link with the picture of the roundabout markings:

https://drive.google.com/open?id=0Bw...zg1bHJKYjVNRFk

I just had an accident on the roundabout, I was driving on the outside left line (black arrow), trying to go straight. Lady in the other car was driving in the middle lane (red arrow), she tried to turn left. I was in front of her, accident happened when she tried to turn left.
She kept saying it is my fault because I can't go straight from the left lane.
Before I entered the roundabout road markings were saying I can go left or straight.
So whose fault it is? Mine or hers? In my eyes she changed the line so she should wait until the road is clear, am I right?

Thanks for help