Tri colored mare - history sought

I am trying to trace the past history/breeding of a tri-color bay and white mare, aged 9 to 14 years approx, 15 hands approx. Has white showing round her eyes. Possible arab/TB/saddlebred breeding. scarring on one rear leg fetlock area. I have had her a few weeks and believe she was sold in a sale possibly in the Chicago area.
She is very easy to handle and has been well schooled by someone, probably in Hunt seat equitation. Has probably had at least one foal. A little bit mareish and likes company, not keen on shots but no problems or vices.
Its a shame to have her breeding and any competing history lost