Poison ivy is not a common plant in my neck of the woods so I am unfamiliar with exactly how it grows. But I would suspect that violets are not going to keep it at bay. I think you need a larger, more aggressive groundcover, preferably one that is evergreen.

Where are you located (geographically and by zone)? Knowing that will help to provide more suitable choices.

We are in southwest Ga. I believe we are in zone 8, almost 9. Thank you very much!

Where are you? If poison ivy is not common there, it sounds like we need to move there! :)

Look at Liriope spicata or Asarum europaeum.

We may not have quantities of poison ivy here but we have enough other nasty plants to keep life interesting - poison oak, poison hemlock, nettles, various prickly brambles (including Himalayan blackberry that can entangle a large horse) and giant hogweed. No place is completely without some drawbacks :-)

Asarum europeaum is a lovely plant, but it is veeerrry slooow to increase--years for a clump to enlarge. Not a practical groundcover unless you have thousands of years to spare. And it most certainly won't choke out PI. You'll have to kill the PI. Spray leaves with woody plant round up and if there are large, thick stems, cut them and apply woody plant round up directly on the cut stems. Keep it up for a couple of years until it gives up. The longer you wait, the worse it will get.