You can't release her. You've had her inside for three months and at
this point it's too late and would be cruel to do so.
Three months is a teensy amount of time in terms of socializing a feral.
If you want to make better progress your best bet is to separate her
from Harold, cage her and start working with her one on one. You can
read more about the specifics here:

http://groups-beta.google.com/group/rec.pets.cats.health+behav/msg/0d0486868356b
c98?hl=en

It can take several months to make progress with a feral and sometimes
years, but it is an extremely rewarding experience that I, and I'm sure
others in this group that have feral cats, wouldn't trade for anything.
At this point you don't have much choice but to work with her and as
long as she's safe and happy, that's what matters.

I'm working with a couple right now that trapped an adult feral last
October and, although she has been harder to tame, she continually makes
progress and every tiny little step she makes is seen by her guardians
as a major breakthrough and they are regularly thrilled, especially
since they have never done this before and were absolutely terrified
when I first met them.

Needless to say, as time has gone on they have fallen in love and
learned to understand their little cat and be patient for however long
it takes. Hopefully you will do the same. :-)

Megan