I can only think of one reason, which is that she may have seen me give a car ride to a disfellowshipped person months ago.
I can think of many other reasons:
1. She's a bitch.
2. She believes in, and/or likes starting gossip. She may feel entitled to treat you that way based on all kinds of bad information as a result of filthy gossip.
3. She's jealous of you and/or your position. As the wife of the coordinator, she feels entitled to be a leader among other women, and therefore she may feel like she's entitled to have authority over other people in the congregation.
4. She's jealous of you and/or your position. As the wife of the coordinator, she feels trapped in her position, having to be completely submissive and be an example in the congregation, an resents that you don't have to put up with that nonsense.
5. She did see you with a disfellowshipped person and she's actually trying to do what JWs are told to do.
6. She's a social predator and feels pleasure out of seeing other people suffer.
Either way, do you need her in your life? Do you have to interact with her? Do you think that you need her approval? Do you think that she has any power over you?
If you are depressed, I understand that you may be extra sensitive to this type of treatment. It's uncalled and you don't deserve that kind of treatment for and it's difficult to deal with shit like her while you're dealing with depression.
Keep reminding yourself that you are in fact in a much better position than, even if she herself is PIMO. You don't have to deal with the pressure of having a husband who has a position in the congregation. She has to be submissive, an example to the congregation, and anything she will do will affect her husband's standing in the congregation, which she has to hate with passion.
Ignore her, avoid her, but most importantly, remember that you want her and shit like her out of your life anyway.