I have a hard time believing that Biesen would have built a rifle for Eleanor O'Connor with a Monte Carlo comb, a "Stegall" forend tip, and a steel butt. For these (and other reasons) I doubt like hell that it's her rifle.

FWIW, the rifle that was gifted to Eleanor and soon sold off because it was too heavy was a custom Mauser by Pachmayr in .270.