UPDATE!
I'm so glad we did this; it's not at all what we expected! We had no idea what Margot was. She was listed as a terrier mix, but she looks remarkably like a basenji and really doesn't bark. She is capable of barking, is larger than a basenji, and has a straight tail, so we knew she wasn't a pure basenji, but we had ourselves convinced that she was at least a basenji mix. I have also had multiple people ask me if she is a huge basenji while we were out on walks, so it's not just in our heads, lol.
The great reveal......26% Australian Cattle Dog, 24% Blue Lacy, 13% Lab, 10.7% Pit Bull, 6% Bull Terrier, 5% Boxer, and 15% Supermutt. Apparently one parent was Australian Cattle Dog/Blue Lacy, and the other was a mix of all of the others. The funny thing is that the Australian Cattle Dog was on the quiet dog list, and they are readily available here in Texas, but we decided against hunting one down because of the shedding. Funny how things work out. We now have a short haired Australian Cattle Dog who is indeed quiet (yay!), but sheds like crazy. This breed information could explain some of her behaviors. I had actually thought that maybe she had some sort of herding breed in her, and that she was herding the iggies and not so much stalking them. I still think she is stalking Olive a little, but she is definitely herding Tucker.
ETA: She did not have any major health conditions, but she is likely to have a decreased liver enzyme. This isn't serious, but if she ever really does have liver issues, her "elevated" liver enzyme could appear as normal. Nothing huge, but good to know if we ever suspect liver issues.
One of the funniest things about this is seeing her "relatives" that have popped up on Embark. Her "first cousin" lives in Austin and is a pit bull named Larry David. The rest of the relatives that have come up are all bull terriers, which is really surprising. I'm hoping that one of her litter mates eventually does the testing. It would be really fun to see what the rest of them look like, and to see if they exhibit the same behaviors.