I have a Golden rescue that also turned out not to score 100% on her DNA test. Leah had a few issues of her own but has come a long way in only a month. Your Daisy reminds me of her.
We have a second rescue that we are fostering and they are getting along really well so far.
It's so nice to see someone take on a challenge like you have and not give up on their dog. So many people do. That's how they end up in rescue.
Your Leah is a beauty! I'm so glad to hear that she's adjusting well to having a foster at your house. How long have you had the foster dog?