This could be urgent. Take her to the vet ASAP. If she is unspayed there is a possibility she could have pyometra which is an emergency.
In a normal heat blood loss amount can vary, but in my experience is rarely observed as 'heavy bleeding'
Ditto what Ginger899 said. Any time there is unusual bleeding, a call to the vet should be the first course of action. The heat cycles could start to come further apart as a dog ages so it could just be her normal heat cycle, but if the bleeding is excessive, it bears looking into.
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