multiple persons with same email addresses

I created an event with RSVP maker for my church. Quite a few older people don’t have computers and email addresses so one of the volunteers entered several as her guests. She later entered another person using her own email address and it seems that made her name disappear from the list of attendees.

Is it possible for multiple persons to RSVP using the same email address? There should be an option to update a previous RSVP response you entered if you want to add more guests or make other changes, which could resolve this issue. It seems you have to completely reenter your RSVP response and all your guests.

Please advise me of options. Thanks.

https://wordpress.org/plugins/rsvpmaker/