Most excellent question. Based on the information you provided the corrective training could have been a violation of the standards for conducting corrective training.
Doctrine tells us
a.Must not be used as punishment or appear to be punishment
b.Must relate directly to the observed deficiency
c.Must specifically address the observed deficiency
d.Must be discontinued once the deficiency is corrected
e.Must not be used in place of UCMJ punishment
a.Must provide proper resources to complete the training
b.Must be conducted in a safe environment
c.Must not be ridiculous in nature
Being made to stand in front of the TOC could be perceived as punishment- Now keep in mind I do not have the whole story.
If she was unaware of the standard the question becomes why was she unaware. Did senior leadership fail to inform her? If so the Soldier cannot be held responsible. Unfortunately you cannot unring this bell…. what’s done is done.
She needs to decide how she wants to handle this. It may be better just to let sleeping dogs lie rather than start a pissing contest with the Leader. If there is a polite and professional way to discuss the issue with the leader it might be appropriate but she must ensure she is absolutely professional, factual, and unemotional. It may also be wise to have another leader present that is senior to both individuals. Perhaps a discussion with the unit 1SG or commander might be appropriate. Only the Soldier can make this determination. She may feel belittled or harassed but she needs to put this in perspective and make professional decision on the best way to proceed.