That description instantly makes me think of 'Wild Ride Cowboy' by Maisey Yates. The heroine is this sharp, no-nonsense woman running a ranch after her grandfather passes, and she's got that perfect blend of earthy competence and fiery spirit. She doesn't take any crap from the stoic hero who comes back to town. The dynamic is electric because she's not just a backdrop of pastoral calm; she's actively shaping her world, getting her hands dirty, and calling him out. There's a rawness to their interactions that feels very grounded in that setting.
A slightly different vibe, but still fits, is 'Rough, Raw and Ready' by Lorelei James. It's part of her 'Rough Riders' series, which is basically a spicy deep-dive into Wyoming ranch life. The farm/ranch heroines there often have a bold, practical streak—they're running businesses, fixing fences, and know exactly what they want. The boldness is less about city sass and more about a deep, unshakeable resilience that's incredibly attractive. They're partners in the literal sense, which makes the romance hit differently.
I'd also throw in 'Unbroken' by Jay Crownover as a darker, grittier option. The female lead is more of a survivalist living off the grid than a classic farmgirl, but that same essential core of toughness and self-sufficiency is there, dialed up to eleven. Her boldness is defensive and fierce, which creates a fascinating push-pull with the hero.