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I'm not sure exactly what you mean by a "blood blister". Strictly speaking, a blister is not filled with blood but with pus and other bodily fluids. If there is blood in the blister, then perhaps it is not really a blister but a blood clot.
This usually happens when due to a blow or a sharp pinch, tiny blood vessels are damaged without the skin above them being broken. When an injury breaks skin, blood oozes out of the wound, but if the skin does not break, the blood simply collects there. Eventually, either the clot will gradually disappear, or the skin above it will dry up and peel off, allowing the dried blood to also fall away.
Blood clots are usually quite harmless and are nothing to worry about. Usually no treatment is required either, unless there is pain or discomfort. However, it is always good to be on the safe side when it comes to injuries involving the ears, so it is advisable that you let your family doctor have a look at the clot to ensure that no serious damage was done, especially if your daughter is very young. Young children sometimes do not realize subtle but dangerous injuries, and even if they do, they sometimes don't know how to communicate what is wrong.
If what you have mentioned is indeed a blister, you can simply wait for a few days and see if it disappears on its own. As far as possible, ensure that your daughter does not touch it too much or try to burst it. Blisters usually take care of themselves over the course of a week. A warm compress usually helps speed up the healing compress, and if the blister is on a part of the ear that is accessible, you should apply a warm compress to it at least twice a day. What you can do is heat some water in a vessel (make sure that it is not too hot), dip a clean, soft cloth in the water, and then press the cloth to your daughter's ear after wringing out the excess water from the cloth. This treatment is also quite soothing, and is therefore helpful if the blister is painful. When the blister pops, make sure that you clean the area with a clean cloth. If the blister does not pop within a week or if it continues to swell and remains painful, you should visit your doctor.
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