How can I make the most of this free link?

A friend of mine with a somewhat popular blog (heavy social shares, 39 page authority) has offered to link to me for free on her site. The site is completely unrelated to my niche, and she isn't going to publish a new article unless it relates to her blog.

So I have two options?
a.) Hack together a new post that somehow relates to her niche and mine
b.) Find a past mention of my keyword on her site and have her link to my site naturally– "check out my friend Jeremy here")

Given these…

How can I make the most of this free link?