. . . but "inventing" stuff that's already known in our time is not inventing.
Since it is in a bygone era, putting a fork or hydrogen bomb into production is the same thing, it is always borrowing other people's inventions and making them your own.
To invent something of his own she should reproduce cold fusion? space-time travel (not even since she were a victim of it so someone else has already created it)? the cure for Alzhaimer's?