I know there's a way to add domains and set a new one as the primary, but there's a weird window where the site may be down for an overnight or more. If she absolutely cannot be down for any reason, I'd duplicate the Squarespace site, set it up with the preferred domain and let both run for a bit before redirecting the less-preferable domain to the new site. Then she can take the old site down and redirect the url at the registrar level.
So it goes.
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