*sigh*
I don't know how many ways I can say it; my lovely bride of 25 years has less than adequate eye sight.
She needs the vision correction (Diopter correction) of the ocular, and the vision "boost" of very good, multi-coated glass.
A scope that you can see things through that you could not make out with the naked eye.
Given a good scope she can shoot very well. Open sights are a non-starter.
In that case, it sounds like she would benefit from a lot better glass than the VX3.