It could be her best option and choice. I wouldn't mind hearing some quotes from her. I hope she's happy, although I can't say she looks thrilled. There isn't always some ideal choice for people, so having security and temporal needs met by someone you can have some respect for can mean as much as being able to develop fully as a person and finding someone who shares your goals and who you feel a unique connection to on your own terms. We know the man wants children with her. I don't know what kinds of things she desires. Does she want children, a flower garden, an education?
There isn't one way of approaching age difference that applies in all situations from what I can tell. There does tend to be some correlation between older men seeking "child-brides" and women being in a subservient role. The husband takes on more of a parental role than an equal partnership. Cultures in which a woman's will and desire are not considered equal with men often have women marry quite early before they have a chance to develop independently into an autonomous adult. I've encountered a few ultra-conservative environments in which dating and marrying young girls was a bit more common than in the rest of U.S. society.
When Goethe was 74 he fell in love with an 18-year-old, Ulrike von Levetzow. There is something to be said for love transending age, but it can also be opportunistic in terms of keeping women in an unequal role.
