Maybe you can get through to her by appealing to her connection to the group. If she has worked so hard and so successfully raising money for the PTO, how will the group manage after her kids move on to another school? Whno will be able to run those fundraisers after she is gone?

Hopefully you can get her to soften her edges and work with other parents. She might find it quite rewarding.

Hi! You should not have to be the manners police, but unfortunately in this case you may have to be. While it is great that she works hard and her fundraisers have been successful, how successful will they continue to be if she has no support and no one volunteering to help her out.

You say she is now sending nasty emails to PTO parents...is this because they are not volunteering to help her? Well certainly anyone who received a nasty email can respond the her themselves. But, if I were you I would tell her that sending nasty emails and being nasty to people is innappropriate behavior and this is why she is not getting people to voluntter because they do not like the way she treats them. You will have to find a way to get her under control or not let her run the fundraisers anymore.
Good Luck!

I have a volunteer who is a very hard worker for our chool, but is very difficult to work with. She does not listen to suggestions, she belittles the helpers, but her fundraisers are very successful money makers. She chairs two main fundraisers, but no one volunteers to work her events. Now, the she is sending incredibly nasty emails to PTO parents. What can I do? Should I be the Manners Police?