It's implied that Beth recently regained her independence after a long-term relationship.
When Kayce (Luke Grimes) takes his son Tate (Brecken Merrill) to the Dutton ranch for the first time, a brief conversation between the Navy S.E.A.L. and his sister suggests that she has recently come out of a relationship.
"How's Mr. Daniel?" Kayce asks her, to which Beth (Kelly Reilly) responds with a dismissive shake of her head.
"Good for you," he then says.
"Yeah? You're the only one who shares that opinion," she responds, further hinting that the demise of her relationship with the mysterious Mr. Daniel was something the rest of her family were disappointed by.
One thing Beth and Kayce have in common is that they are both free spirits who can't abide being under other people's thumbs. The audience is left with the impression that Beth's former lover was someone who attempted to control her or turn her into someone she's not.
While everyone else around her might have welcomed a man into her life who would be able to do that, only Kayce can recognize that Beth is better off alone than with such a partner.
Since Kayce hasn't seen his sister in a long time, the relationship must have also been somewhat serious or long-lasting.
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