Elizabeth is Courtenay-62, it’s her unique identifier, no one else can have it .
https://www.wikitree.com/wiki/Courtenay-62
Is her URL, if you are on her page and want to go to someone else who isn’t related, you can backspace her name out and type in the id of the person you want.
If it is one of her relatives just click on their name in the data section at the top of the page.