She's beautiful!!! Kudos to hubby's friend for saving her, and to you for taking her in!

First things first - you have to get her to a vet to make sure she's healthy before you let anyone see or sniff her. Once that's taken care of, and she's found to be healthy, I would just keep her in the bathroom for a few days and let everyone sniff under the door. Then slowly, one by one, take the resident cats in to meet her. There will be some hissing and maybe a swat or two, but as long as there's no blood shed..... Just do short periods of time where they can see each other, then take resident cat back out. I would wait to introduce Nilla until newbie is a little more secure. You wouldn't want to scare her right away with an excited doggie.

I would not recommend the carrier. She may feel intimidated and get real defensive if everyone else gangs up on her, which would also be a bad way to start off her stay.

I know others will have good advice also. Just want to say thanks for helping her out and good luck. She looks like a real sweetie.