By the end, the surviving victims fully accept their death and understand Erin's freedom.

Source: https://gamerant.com/the-menu-ending-explained/

Detectives could also search Erin's phone and internet search history and examine any links and associations she had to any clubs and groups.

Source: https://www.dailymail.co.uk/news/article-12414687/Mushroom-deaths-Victoria-Whats-Erin-Patterson-cook-lunch-killed-three.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Erin's parents had to support her 'remotely'

Source: https://www.mirror.co.uk/news/uk-news/student-20-thought-freshers-flu-31023724

It wouldn't be necessary to do a reboot or revival of to understand Erin's life, but one deleted scene from the show gives further insight.

Source: https://screenrant.com/the-office-erins-parents-season-9-reveal/

The murder charges and two of the attempted murder charges relate to the July 29 mushroom lunch, where four of Erin Patterson's relatives fell ill after eating Erin's beef Wellington at her home.

Source: https://www.dailymail.co.uk/news/article-12704431/The-key-piece-evidence-help-crack-case-Victorias-poisonous-mushroom-lunch-murder-accused-faces-court-time.html?ns_mchannel=rss&ns_campaign=1490&ito=1490