Thanks for bringing your question to JustAnswer.
You are in a bit of a tough spot, as she started this Ministry that you volunteer at. As the boss, she has a right to establish how things will be done.
On the other hand, you are volunteering your time, and would like to be treated with respect. As you note, she has some psychological trauma from her wartime experiences. As a captain, she is used to being in charge and giving feedback in a very direct way to fellow soldiers.
She may think she is just giving you examples to illustrate what she's trying to tell you. But this seems to put you on the defensive and it feels like she's doing a tit for tat. You may just have two very different ways of communicating.
If you have already expressed that you don't think those illustrations are helpful, but she continues, you can do either of two things:
1. Decide to turn the other cheek, as she most likely does not do it to hurt you, but out of habit from being an officer. I doubt that she will be able to change her communication style to accommodate you. Unless you feel she has some reason to want to hurt you, this is probably just how she is. Some people actually like being given examples, but it's not for everyone. Sometimes women in the military feel they have to be tougher to prove their equality to the men...and these habits are hard to break, even though she doesn't have to prove anything to you.
2. See if there is another ministry whee you can volunteer, where the communication style is more comfortable for you. You deserve to be treated well as a volunteer who is giving up her time to help.It would be kind to try to find someone to take your place so that her ministry and its good works can continue if you decide to leave.
I'm sorry your attempt to do good has turned so unpleasant for you, but I'm sure there are other charities in town that will welcome you with open arms!