Should i Keep my new dressage saddle? ( PLEASE HELP!)?

So the other day me and my mom went to a tack store looking fro just a few things. Instead she bought me a new dressage saddle... it was on scratch and dent sale ( barely had any on it) for 400. It fits my horse, but when i rode in it for the first time it was a bit uncomfortable and my leg kept on getting caught on the flap. i wasnt really looking for a saddlle and i feel bad because i know that we can barely afford it. the store gave us a 7 day trial and im thinking about returning it. i also feel bad because it has been my moms dream since she was a little girl riding to get a dresage saddle.. Help!! im torn!