Unfortunately not too uncommon for the letters to fade with age. I have several that came off of the track legible and now only appear to have one or two letters. Don’t let that throw you off, if you think it is a TB chances are it is. People can and do make up the horse’s breed all the time but it is rare for them to lie about it being a TB. Usually it is the other way around - they say the TB is a QH, WBx, whatever…
I wouldn’t hunt down any info about that Bend’Or spot – they are rarely recorded by virtue of their variation every year. Some disappear entirely, some stay the duration of the horse’s life.
The pictures do look like a TB to me, albeit an aged one. The hind end is functionally very much Rahy, Forty Niner, and Mr P (although Mr P didn’t stamp). Their offspring are mostly aged at this point and they tend to get straighter and even more “QH-looky” behind as they get older.
I know you can’t diagnose certain things over a picture but the fat fetlocks and straightened out hind end would have me keep an eye on her – functionally horses get straighter as they get older, but the filling would have me concerned DSLD/ESPA is a possibility.
I saw the FB post and agree with the poster who thought it might be Wishtobegood. That pedigree fits what my “mental image” of what a horse by Grey Dawn on top of Slew would look like. Lyphard, although further back, tended towards QHy type horses once fully mature. He himself could have passed as a stock horse once no longer racing fit.