A doctor would be kind of tricky. The easiest way for a beginning blog would be subscribing to adsense (application can take months to be approved), and find some related affiliate deals to her work. Problem with affiliate marketing could be location. You have to find business with affiliate deals in the country her audience is at.
But first you have to build traffic to her website to a decent amount to be considered eligible for any type of advert deal. Also build up the social media following and the blog should have lots of quality content.
I would say you should focus on promoting the book right now while working on the blog and social media growth.
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