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As long as they are separated by a fence, they should be ok. Since she is a rescue, you might want to quarantine though.
Just my thoughts, and I could be wrong, but I am thinking that when and how the adults react depends a lot on breed. I have had breeds that were more aggressive and those that were very docile. One chick escaped from the baby pen into the adult pen and was pecked so badly we had to put it down. I think that if it had gone into the other adult pen with the less aggressive birds it probably would have been fine. Of course, lots of space and places to hide are key and as mentioned earlier the ratio of adults to babies.
My RIR's are a little more aggressive than our Leghorn, but they don't peck them to death. Usually it's a "go away" peck.
I'm not sure if this is an acceptable answer, because I don't completely know your situation. Adding 2 when there are 8 is hard. From my experiences, the best way to introduce is to have a new-old chicken ratio be at least 1/2. And unless you're adding 1 rooster to a flock where there is no roosters yet, never have just 1. I did that once and the bird got scared and ran off. I looked for 2 hours before finding her in a shadow of an old building. It was especially hard to find her because it was in the dark and it was a black australorp. I told my neighbor who I bought if from that the chicken was lonely and scared and offered to give it back to her. She was really nice and she sold me a Golden Laced Wyandotte so it wasn't lonely and scared.We currently have 8 leghorns (no rooster) and are thinking that over the years we may add about 2 girls of different breeds at a time. Possibly a group of 2 every other year. We have lots of room both in the coop and yard for them, how much do I need to worry?
We are thinking about maybe stars or RIRs.