Check your arrow and the site of the hit for hair.
This can help you tell where she was hit.

If I remember correctly, bright red blood presenting a good blood trail that fades to pindropsover a long distance could be just a muscle hit. Pushing her now could help her keep bleeding by forcing the blood to keep flowing and not coagulate. If she beds too long, she'll scab up and might live.

I haven't seen a lot of liver blood, but I think it would be darker since the liver filters the blood on it's return to the heart after it has already delivered it's oxygen to the restof thebody. Not as dark blood as a gut shot, but darker than lung and muscle.