There is a good article on this website about dealing with difficult people, I read it last night and I recommend you do too. Often when people act like this it is because they want something they aren't getting and don't know any other way to get it--like kids, now that I think about it. Your challenge is to figure out what she needs, so put your (child) psychology to work here. Maybe she is frustrated that her position is just a formality...can you give her more responsibility and control? Or maybe you could give her a project that will help her feel like she is making decisions. Ultimately, it doesn't matter if she votes no since you have the votes you need to carry on, but helping her get what she wants--as long as it is line with your goals--could make your year a lot easier.
She sounds like a pain. But really, so what, if everyone else votes yes? Treat her with the respect you would like her to treat others and move on with your agenda. When you are the one saying no and everyone else is saying yes, people will remember how you handled this!
Our Treasurer seems to be upset with everything that we do. For our Fall festival. We spent 77 dollars, all together. We had everything else donated. Our Treasurer is new to the officers list this year and she doesnt control the money. Our school secretary writes checks and everything. The treasurer is just a formality. A checks and balances really.
But the problem is: The treasurer has yelled at me. *the new president for the year* for wasting money on the fall festival. which $77 was not wasting. It was concessions that donations did not cover. We profited over $1500.00 on the festival. Our treasurer has voted NO to everything that the officers have wanted to do for the school this year. We have enough votes to go ahead with things but its frustrating that she votes no to everything and is against everything that we do. She is older than all of the PTO and acts like we are incompetent.