I have these questions for clarity running the update AGAIN after the initial D7 -> BD update. I'm fine running that the first time.
What to do to the BD site besides dropping (emptying) the database.
We will do a full export of the config. Do we delete the config directory or does the update script rewrite the existing one?
Do we keep the db credentials as is, and then settings.php stays as is?
I believe she was referring to running update.php again on the migrated database (i.e. the database as it ended up after the first run, without emptying it), just in case any of the hook_update_N for any of the modules failed the first time.