Yes there is – if you have the numbers.
The number of people on the EC has to be determined by resolution of the owners at the AGM. When that resolution comes up, propose a number that will keep her off the Committee. That is, if you and 2 other people want to be on the Committee, and she is the only other person, then propose that the number is 3. You then have an election to fill the spots and presuming she doesn’t get the votes you are fine.
As I say you can only do this if you have the numbers. Otherwise you may have to talk to her friend and the new owner.