Cathy took Ellen to get tested on Saturday, and I got a call on Sunday indicating that everything came back negative! Yeah! So, it is confirmed that Ellen is as healthy as she looks.
The other cats all investigated her now that they are allowed to touch her. Zechariah was quick to pin her down and bathe her... :-)
She eats solid food now, so we're about done weaning her. As soon she gets spayed, she can go home to her new mommy & daddy, who have picked out a new name for her. So we'll get to enjoy Ellen for a few more weeks.