You have it backwards too, she should be deaf, not quiet.You have it backwards... what you need is a quieter GF
X4 is probably your best bet. Scissors would be (considerably) quieter but there's none that I know of that does anywhere near consistent even 4KRO.
X6 isn't bad at all - I don't know about 'horrible' ghosting. It has for the most part consistent 6KRO with the exception of Ctrl-R.