Its really difficult to comment on 'breeds' as in the UK we have different terminology. If she has feathering on her feet then she has a 'wild pony' in her somewhere. We have some horses called Gypsy Vanners or Welsh Cobs who are pony sized horses with feather. Have a look at some of the British native breeds on the net: Highland Ponies, Welsh Cobs, Dartmoor ponies. I have a feeling you will see a lot more of her heritage but going way, way back. No doubt that she has Arab and Connemara in her somewhere though. Get her seen by a good farrier who will balance her feet for you and sort out any problems. She is sooooo pretty!