Drop TES4Edit, the EXE, in your Oblivion folder. That way, Wrye Bash will detect it and add a shortcut for it along the bottom of the Bash window. I will update this post with some instructions in a few...
OK this didn't work for some reason. I dropped the exe in the Oblivion folder but WB hasn't loaded it in the Launch bar at the bottom left. Is there something else I need to do? I closed WB and opened again several times but it's still not catching it.
Edit: While I write up the instructions, you may want to launch TES4Edit (try out the Bash shortcut) and track down Mazoga's NPC record. At the first dialog, you only have to load the Oblivion.esm, so right-click, choose unselect all, and put a check next to Oblivion.esm. Hit OK for the next window, and (once TES4Edit finishes loading) expand the NPC branch. Click on the "Name" tab to sort the records by name, and find her record.
OK got it. I double checked it on the web (I remembered there were instructions to set her essential). The ids match and I got the id.
OK I'm going to try your other instructions now (above this post).