Look at the blood splatter on the doorjamb, floorboards, and pavement under her window. I actually think the blood on her left thigh/leg is predominantly from her fatal head injury. If you look closely, her pants aren't even torn. I believe that most of that blood pooled on her thigh when her head slumped leftwards on her neck. Severing the femoral artery would have crated a lot more blood in/on her pants than was already there.
Speculation, obviously. But I think close examination agrees with me.
I agree. There wasn't much blood on her right leg, either.