Hi @cmplxty. Great she's entering the contest. The program is free to use. There are other photo editing program alternatives to Photoshop. Just search for free alternatives to PHotoshop. Some ask you to create an account.
Good luck in the contest. It's a weekly one, so she can enter each week. Just follow the rules carefully.
Take care, and I hope to engage with your wife in the future. Have a great day.