I'm sorry, what is the poll? To me it says "do you use a for your horse?" and I'm not sure whether you are referring to a bit or a bitless. That being said, there is no harm in trying it out as long as you recognize signs that it isn't going to work. If she is irritated by it, you will need to go back to the bit. I generally prefer to ride with a bit, but I have ridden some horses that handle better in a hackamore than a bit, particularly one Morgan who had a very large tongue and found it more comfortable without a bit. To add on, you can easily hurt a horse in a bitless as the point of pressure is on a fragile section of the nose, so one is not truly gentler than the other. It just depends horse to horse whether they do better with nose band pressure or mouth pressure.
"The trouble with the world is that the stupid are certain and the intelligent are full of doubt"