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The blood may be due to the injury
. Some of it must have collected after the trauma and came out. Although in your case it seems pretty harmless, still I suggest you pay a visit to a pediatric surgeon. She might need an X-ray of her skull to rule out any fractures
or other injuries. In case she developes epistaxis
(bleeding from nose) again then lift her chin and pinch her nose. Ask her to breathe through her mouth for a while and it should stop. If it was just one episode then i don't think you need to worry much. She should do well.
Hope that helps
God bless you