Hi niceglasses. I used to run a first aid company, the things to look for are:
Concussion - Pale, cold clammy skin, rapid shallow breathing, rapid weak pulse, nausea, loss of memory.
A far more serious condition which can follow a concussion a couple of days later is something called cerebral compression:
Symptoms are opposite of concussion,
red hot flushed skin, slow noisy breathing, slow pulse. Not meaning to sound alarmist or anything, but if you notice these signs and symptoms get her to hospital asap.
I would add, is your DH sure that she wasn't knocked out. Even for a nano second, if she was then she needs to be seen at hospital.
I'm sure she will be fine, but if you are in any doubt at all then take her to see a doc.
Let us know how she is and how you get on.
HTH x