Thanks for the all the replies, gentlemen! I posted this up on Gunboards, as well, and a member was able to provide this:

Original U.S. WWI M1917 Doughboy Helmet- 104th Infantry Regiment Yankee Division with Textured Paint ima-usa.com

I don't know if the information contained in the listing is correct or not, but at least I have a lot more information than I previously did to try to give her some details.