I've had both solitary ferrets and couples. My first female (Stinky) was fine with her roomate, but my second female (Bandit) hated any others. I guess it depends on the ferts that you're trying to pair up. Bandit liked my cats & dogs, but she just hated other ferts, male or female.

I hope we'll get to see pics if you and Ferra decide she'll fit in!