Horses can be very clumsy!

i was just doing some research on google and some horses get blood noses when they work and there is nothing wrong with them. It would be best if you wern't going to make a vet appointment (she may not need it) but just to keep note on how much she bleed, how often, if she has had new feed supplements (sounds weird but could be a side effect), if she has been swaying her head slightly or anything differant that she may be showing. I'm not a vet, but in research and articles i have read it will be best just to take not if its not too much blood to warrent a vet visit.