I see a microphone in your attachment, can you use the speech feature to ask her a search question?
Try a right click on search (Ask me anything) bar depicted, click on settings, the task bar settings should open. In the top left you'll see a search box "Find a setting" type in "Cortana" and the user settings should appear for Cortana customizing or turning it off. I don't use Cortana, have no use for it. I use my search for windows only; apps, file and settings.