I wouldn’t go down the bullying path as it probably comes down to he said she said.
Get her off the committee. At the next AGM do the numbers on who wants to be on the committee (not including her) and set the number of committee positions to that number and make sure you all vote for each other and not her.
Remember before you elect a committee you set the number of committee positions. You can have between 1 and 9 committee members