I would agree. Although, I wouldn't agree she put the blood there, if it was a type of animal blood, that she most certaintly, couldn't acquire easily.
The blood was not in the car when she left the house in the morning, so either she put it there as part of a well planned suicide, or she didn't put it there and this was not a suicide.
Upthread there's a comment protesting that the blood is still under discussion, as though is it something that can be set aside in the debate of murder or suicide. Rather, the blood is crucial in understanding whether it was murder or suicide.
Naturally, some may ask how we can be certain that the blood was not in the car in the morning. The answer to that is simple. Clearly it was visible, we know it was not completely dry, so it's safe to assume that any rational person who gets in the car in the morning to go to work is going to be alarmed and call police if there's a pool of blood in the car.