Deleting an app that Macbook Pro says is running, but is not listed under the Quit Menu

Oops...meant to include this article that explains how to fully uninstall Gemini2:

How to Uninstall Gemini 2

When you’ve cleaned all the duplicate files from your Mac, or are simply finished using the Gemini Cleaner, you may want to remove it from your Mac. These instructions will guide you through the process:

• Begin with removing the main app from Applications folder in Finder. Drag and drop Gemini 2.app to Trash
• While still in Finder, use the combination of Shift+Command+G to open Go to the folder window. Open the following directories one by one to clear out associated files: 
  • In ~/Library/Preferences move com.macpaw.site.Gemini2.plist to Trash
  • In ~/Library/Caches delete Gemini 2 folder and com.macpaw.site.Gemini2
  • In ~/Library/Application Support trash Gemini 2 folder
  • In ~/Library/Logs remove com.macpaw.site.Gemini2 folder

With all of these files removed, your Mac fill be fully Gemini-2-free. 

I'd suggest booting into Safe Mode and trying to delete it from there: Use safe mode on your Mac - Apple Support