H.B.
When my first daughter was learning to walk she fell several times and got huge goose eggs. My doctor said the forehead is a very thick, strong bone that can generally withstand some pretty terrifying falls.
It doesn't cost anything to call the advice nurse, so do that just to put your mind at ease. I also don't mind dropping in to see the doc (my co-pay is only $15) just for the peace of mind.
I would say she is probably just fine if there are no other issues.