Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
An account was created on my.scouting.com but it was not able to be found using the search in scout book. Another account was created when trying to link the parent to the scouts account using the same email address as the account created on my.scouting.com. Parent still is not linked to scout.
Does she want to retain the my.scouting.org ID that is her e-mail address or the portion of the e-mail address before the @? If she only knows one password, I recommend keeping that ID because I do not have the ability to reset passwords, only merge accounts.