I'm very sorry for your loss. The same thing happened to us a few weeks ago. I would have kept her, she would have been fine with the chickens. Our survivor was a broody turkey hen, her eggs are set to hatch any day now and the next batch of hatching eggs should be arriving in two weeks. I'm tempted to get more keets too, but going about it in steps as to not overwhelm myself.
She's been doing great on her own, but I think it helps that she's been broody.
So, if it's not too late to get your guinea back, I'd bring her back home, at least she was familiar with your chickens.
