Possibly a concussion from the collision?
Possible - my gelding is at least twice her weight and they hit full on chest on chest with both horses at gallop.
As soon as I can kick my 20 year old daughter out of bed, we will be heading to the feed store for some 'just in case' supplies...
alfalfta pellets - to get her to eat everything listed below
The feed store opens in ten minutes so hopefully my daughter will move out of bed eventually... bingo, she is now up and making tea.
As for vet, it was discussed, but was not called. The simple truth of the matter is that if it is not something acute that needs immediate attention - like bones sticking out thru the skin. I can handle most situations myself. She will see the chiropractor next month in case it is her back - reguardless of how she feels this morning.
I can do most small area stitches myself too - it is only when there are arteries, tendons, or bones involved that the vet comes out. I have, in the past, allowed vet to run up thousands of dollars of treatments, putting my horse through a living hell and nothing less then torture for what turned out to be less than a 10% chance of the horse ever being 'normal' again. In all three above cases, a different medical consultation suggested immediate euthenasia.
In general, I trust vets about as far as I can toss them.