If you wish to know more about the history of the mare...you might try to contact Dick or Karen Bingham (Quarter Horse Farm) located in Harvard. Dick is a past QH President and Karen is a Director Emeritus. Harvard is relatively small (maybe 8,000 population) and they are very well respected within the Quarter Horse industry. My guess is that in a burg that small...they probably know a great deal about anyone who has raised horses in that area.
I happen to own Almadina, your mare's dam. She was trained for competitive driving, is a natural jumper and now schoolmaster. I have seen two of Alma's daughters, by the same stallion and possibly one of them yours. I have been able to acquire a little information about her background; you may contact me directly via email. Incidentally Alma is a 1983 foal, so is now 27.