When the book series begins, Enola Holmes has just celebrated her 14th birthday, so it's understandable that marriage isn't on the horizon for the fictional character. 

She runs away to London to investigate her mother's disappearance, and to avoid Mycroft (played by Sam Claflin in the film), whose plan is for her to attend finishing school and ultimately get married off. 

While there, she decides to look into Lord Tewksbury's disappearance, and she wants it to be the first big case that she solves. In the movie, she coincidentally runs into him, which is a main difference between the two.

Though many viewers felt the chemistry between Enola and Lord Tewksbury in the film, the character is not present in any of the five subsequent novels in the series. Enola does not get married in the book series.