Set two different emails in Settings

Hi,
I’m not aware if there’s a workaround for this request already; please excuse my ignorance, if that’s the case.

I have this WP site with a friend. Both are admins, and I wish she could get the comments on her email, as I do. But since there can only be entered one single address, I’m the one getting all the feedback and she only can check it out on the webpage.

This is what it says at one side of the Email in General Settings:
This address is used for admin purposes, like new user notification.

How can I put two or more addresses into it?

Thank you very much in advance…

Betty.