You might not have to turn her over to a shelter in order to have them POST her on their website! We post private adoptions all the time. Helps get the word out to more people that any one individual. AND, you can do any screening of possible adopters yourself.

But, seclusion in a room (if possible with your house) is a perfectly acceptable solution. One of our rescue volunteers has multi cats with 1 in a room by herself. The lone cat is picked on CONTINUALLY b y all the others, so it is for her safety.