Yes, there is! On the guest list, click on the columns button on the top right. Then add the RSVP Link column.

For the primary guest, you can see their personalized rsvp link. Copy paste that into a new browser tab. You can now edit their responses.

Be careful, any updates they’ll be able to see too if they revisit their link. They’ll also get a notification if you update their will attend / won’t attend status