Well believe it or not (watch me get this wrong!!) I don't think there is much CB in there (wanders away disinterested - joking - she is very pretty) Too long in the back and not enough bone for a CB, however the head would fit on a CB body
More TB crossed with something from across the water - Hannovarian?
If it helps she is by R Mellow Kinsman ex of Blythwind Showgirl & that is the society she is reg with. Her breeding includes TB, Arab & QH and shows just how difficult it is to guess breeding as she is a true Heinz 57! http://www.allbreedpedigree.com/alder+last+tango