[name_f]Janet[/name_f] isn’t a terrible name, but it is a solidly grandma name in this day and age. I think using a similar name is a wonderful way to honor your grandmother.
[name_f][/name_f]I like [name_f]Julia[/name_f] [name_f]Charlotte[/name_f] or [name_f]Charlotte[/name_f] [name_f]Jane[/name_f] most from your list. Another idea I had was to use the name [name_f]Jane[/name_f] with a “T” middle name (because then her name would say [name_f]Janet[/name_f] without being Janet):
[name_f][/name_f][name_f]Jane[/name_f] [name_f]Thea[/name_f]
[name_f][/name_f][name_f]Jane[/name_f] [name_f]Theresa[/name_f]
[name_f][/name_f][name_f]Jane[/name_f] [name_f]Tallulah[/name_f]
Best of luck!