I am fimilar with the case. All of her DNA is part mommy part daddy. It's not just the dad or just the mom. It is mixed. She just has different mixes of DNA in different areas. No different than me and my brother having different mixes of our mommy and daddy. Except those mixes are in one body. Chimeras are combined would be siblings, DNA works the same, just might be different in one area of the body vs another.
Yes one animals traits can dominant over another. I notice it seems any ball hybrid has a ball head. However the pattern and body makes it obvious to what it was mixed with. There have been quite a few blood balls aka superball. None I've seen could be mistaken for just a ball.
So even in polypoid situation, which btw is a huge leap imo, the resulting chimera would still have 2 separate DNA that are both the mix of mommy and daddy.