How old was she when she had her first child? Did she, of her own free will, choose the man she married OR did Jeffs, her father, or one of the elders of the community make that decision for her?
These, of course, are rhetorical questions. I don't expect either she or her husband to say other than that they "freely fell in love with each other" and their decision to marry was totally between the two of them.
That's not the way the FLDS in Texas works. Jeffs, the "Prophet", who receives "direct revelations from God", makes all the decisions.
AFAIK, arranged marriages are not per se illegal. If the marriage was otherwise legal, then the reason for it are irrelevant as long as both parties enter into it willingly. I know at least two men whose marriages were arranged. In both cases their wives got the short end of the stick, but those wives are or were (one, a pediatrician, is deceased) Both men are near 60 years old now, and both from India. One is an engineer by training the other a PhD (US school) physicist. The physicists wife has two master's degrees, one from a US school. Both women were pretty good looking when they married. But arranged marriages are still common and expected in much of the world, including India. Some families try to arrange a marriage for their US born daughters and sons, but the "kids" rarely go along with that, but if they want to, they can do so legally.