ok, first off, you didn't say what color it is, so I'm assuming Dora colors! Try soaking the blood drops with your dish soap. I am involved in a great company that makes something that would work awesome on that, but that would take a bit to get you going in it. If you are interested let me now, otherwise, let the dish soap, (dawn works best) set in, scrub it some, let it set and dry and then try washing it by hand. (use cold water) If that does not work...... you can try just a bit of lemon juice, but rub it together and then wash it out....don't want it to discolor.
Next time, if this happens, immediately, put the area under cold water. If she has it on, put a towel behind the stain and then scrub with soap on top. That pushed the blood through the cloth onto the towel behind it. This works on most anything, dirt, soda pop, whatever.
Good luck.