OK, That association counts any TB blood that appears in a pedigree of an ancestor foaled 1941 and after.
Based on that, and assuming that the foaling dates and pedigree info on allbreedpedigree shown behind your mare are correct, I have a rough % worked up for her.
Sugar Bars, f.1950, appears 2 times in the 5th generation (counting your mare's sire and dam as the 1st generation) so Sugar Bars' TB sire would be in the 6th generation twice, 2 x 1.5625%.
Grey Badger III, f.1947, appears once in the 6th generation, and he has a TB dam. The horses in the 7th generation (where Grey Badger III's dam is) count for .78125%, so 1 x .78125%.
Watch Poise, f.1946, appears in the 5th generation and has a TB dam, so her TB dam in the 6th generation counts as 1 x 1.5625%.
Blob Jr., f.1947, in the 6th generation has a TB sire, so for that TB in the 7th generation, 1 x .78125%.
Mr. Pig String, f.1961, in the 5th generation has a TB sire, so for that TB in the 6th generation, 1 x 1.5625%.
Beggabird, f.1942, in the 7th generation, has a TB sire, so for that TB in the 8th generation, 1 x .390625%.
Pepper By Busy Deck in the 7th generation also has a TB sire in the 8th generation, but I don't have a foaling date. If she was foaled prior to 1940, thats another 1 x .390625%.
Assuming that Pepper's TB is counted, that makes your girl 8.59375% TB, or 91.40625% Foundation QH.