Pearlsacarolsinger
Up in the clouds
I am nowhere near Horsham so can't help but I would take both ponies back, save yourself another journey in a few weeks' time when they have decided that they don't need/can't handle her. I am sure you will be able to find a child near to your home who would like to ride a well-schooled pony. PC/RC will probably be able to help with that.