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I was wondering more about the effect of a link coming from Steemit out to a web site.

Her pages already rank very well for localized searches and a few, well placed & very relevant links from a high DA site like Steemit would make her site untouchable.

What I meant is that if you have a page for her business and get active with it, not only her website will benefit from the domain authority of the link but also the page authority from her account. An inactive steemit account will have page authority 0...while mine, for example, has a page authority of 39!