if poss just ring the docs to get her checked. they will most likely be quicker, and if she is indeed fine, then x-rays will be un-needed (ie, making A&E useless).
when my DD3 was the exact same age she was in her pram....a very bouncy pram at that!.
I was getting DD1 and DD2 ready for school and DD3 was crying for a feed (she was having to wait tho.)
the girls went to rock her in the pram, but got rather too vigorous and ended up tipping the pram up. DD3 went flying, literally, into the hearth of the fireplace, and then lay still crying for said feed. I was horrified, girls wee screaming, and then panic!.
anyhoo.....got girls to school, fed baby to calm her down, and rang the docs who fitted her in immediately.
doc was completely reassuring. baby was fine , (altho I was less so as shock had set in and I got tearful and shaky), and the doctor explain how well babies bounce.
because babies have no expectation of hitting something and it hurting, they don't therefore tense up. it means that when they hit the floor they are so relaxed they 'bounce'. it is the tensing up that hurts most, as when we are rigid we are more likely to break.
that is not to say it is ok to drop them just makes it more likely that will will come of injury free IYGWIM.
hope she is ok, and that you calm down, and more importantly, that mummy forgives and forgets so that she doesn't slyly remind you when baby is a teenager!