It will eventually go away on its own but the ear will crumple.
You need to treat the underlying condition that caused her to traumatize the ear too - mites, ear infection, fly bites etc.
You can use a teat canula to drain it if you want to try that at home.
Taping the ear to the other ear up over her head can help keep her from causing more bleeding in the flap.
You can read about this problem here
www.marvistavet.com/html/body_aural_hematoma.html
Hope this helps you!
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