Thank you for the update - eating, drinking, and even hating pills are healthy signs. Laying down is OK - she's saving her body's energy to heal. Moving around a little and coming up to you shows that she's in good spirits and she knows you're still her friend.
Whiskers not using her kitty litter - is this her usual behavior or only since she got hurt? (Big changes in excretory functions can be a warning sign, but a small change is no big deal.)
Hating the e-collar is pretty normal for cats and dogs, but it's only for a little while. Sometimes wrapping a kitty up in a towel so that only her head sticks out can help in getting the pill down. Praising Whiskers afterwards and giving her extra affection and/or treats can also help her feel better about pill time.
I don't know what the 6-month rabies quarantine process is like, but it sounds like she'll have to be isolated from human contact. However, you can ask about it when you turn her over next week - get her intake # so you can have a way of checking up on her.
(According the New York State Dept of Health, rabies has been mostly carried by wild animals, especially bats and raccoons <http://www.wadsworth.org/rabies/history.htm
> - it's rare among housecats, but they can be endangered if bitten by a raccoon in a fight.)
You've done right by Whiskers - not only have you gotten her the necessary medical attention, but you've also taken good care of her all these years. If she wasn't a strong cat, she might have died from the fight instead of just getting injured.
Your parents are to be congratulated as well, helping take care of Whiskers in the midst of moving house which is very draining in of itself. And to give up their anniversary plans - one way to look at it is that they sacrificed their original plans in order to do something selfless and deeply humane. It reminds me of the story of Tetsugen <http://www.inspirationalstories.com/3/346.html
>. A single act of kindness can transform a moment of disaster into a moment of grace.
As for these last few days you have with Whiskers, they are precious days, no matter what will or may happen. Play with her, cuddle with her, take lots of pictures with her. As much as you can, don't let the sadness take away from the joy of being with her, because days like these are days that will stay crystal in your memory.
I wish the best for you and Whiskers and your family.
P.S. It may be a little late at this point, but petfinder.com has a pretty good list of rescue organizations. Go to <http://www.petfinder.com/pet.cgi?action=5
> and put in your zip code.