idk man. I did it on the 0.22.1 build to be certain I wasn't bullshitting you. So I sped through Act one, and successfully made it to act 2 after trial and error of investigating her, and doing anything else I could. Maybe Arc could make Pixie a little more specific on how to find Emma as even I was confused on how I got it to happen
Edit: I did see that you were using the 0.21.6 build, and I'm pretty sure that's why. That build is several months old at this point and I'm pretty certain there was a bug in one of the builds that prevented Emma from appearing at all