It is my understanding that, if she broke 200, she would shoot off for High Gun for the event. If she loses that shoot off, she would fall back to Lady II, and shoot off there if necessary. She would not be eligible for Class D trophies.
Now, if she broke a 199 AND a 200 was shot for High Gun AND a 200 was shot by a Lady II shooter, then she would be eligible for D Class as she was not in the running for either of the other categories.
From the ATA Rule Book...
3. Any shooter who is tied for event Champion may shoot-off/carry-over
for the Championship trophy. If a shooter fails in the championship
trophy shoot-off/carry-over and has declared a special category at
the time of classification, the shooter will fall back to the declared
special category.
4. Any shooter who has declared a special category at the time of
classification and whose score qualifies for any trophy in his/her
declared category, will compete for the category trophy and not for
place, class or yardage group.
5. Any special category shooter whose score does not qualify for a
trophy in his/her category, may compete for place, class or yardage
group trophies.
Now, if she broke a 199 AND a 200 was shot for High Gun AND a 200 was shot by a Lady II shooter, then she would be eligible for D Class as she was not in the running for either of the other categories.
From the ATA Rule Book...
3. Any shooter who is tied for event Champion may shoot-off/carry-over
for the Championship trophy. If a shooter fails in the championship
trophy shoot-off/carry-over and has declared a special category at
the time of classification, the shooter will fall back to the declared
special category.
4. Any shooter who has declared a special category at the time of
classification and whose score qualifies for any trophy in his/her
declared category, will compete for the category trophy and not for
place, class or yardage group.
5. Any special category shooter whose score does not qualify for a
trophy in his/her category, may compete for place, class or yardage
group trophies.