Reporting back as promised.
This did not work; [Mail] was not offered as a choice
Go to a note.
Highlight (select) the part of the note that she wants to share.
Right-click or Control-click.
Choose Share.
Choose Mail.

We also checked on these settings and everything is set up as it should be.
I¡¯m thinking that may also mean you have to have an iCloud ?email account set up and synced to iCloud. ?Apple does not specifically say that, but seems it might be worth looking at the mail and iCloud settings. In my Extensions settings, Mail is shown but I can¡¯t select or unselect it, it is just present. ?I do have iCloud mail set up.
However, we did note when she opted for [Collaborate] instead of [Send Copy], a Gmail account was among the choices offered.
Does this suggest anything to anyone?
Bob
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Don¡¯t forget: ?¡°Good?health is merely the?slowest possible rate?at which one can die."