I have been thinking about who put the inhibitor thing inside Nora and I’m more than convinced that it was Barry. Think about how Iris was kept in the dark and how upset she was about it. Then how she became the biggest supporter of Barry as Flash. There is no way Iris is putting that device into Nora.
I may not have the correct person who does but I’m pretty sure that Iris didn’t do it.
Whether it was Barry or Iris, I suspect that either had a very good reason to have that inhibitor placed inside Nora. And I suspect that it has a lot to do with the fate of Zari Tomaz's family.