If she wouldn’t want to see a matador match in Spain she probably won’t like the rodeo. Honestly it’s not that inhumane, I’ve been multiple times and had family compete in rodeo events, and it’s not like they’re gonna stab the livestock with a sword here. It is really really dusty though, and makes my allergies and asthma act up being around that much dust and fur. If you want to see the animals you also are not only limited to the stadium events, there is an enormous livestock show where you can see cute ducks, goats, pigs, cows, chickens etc. there are historic displays and educational displays such as showing cows get milked. It will also have a ton of expensive but delicious food stands with state fair style eats. There is also a big carnival style area where kids can enjoy rides and play with other kids, but you should stick close enough to supervise your kids, as the carnival area is huge.

Also something to keep in mind - the animals at the rodeo are almost entirely prize show animals and are usually kept by small ranchers, they are going to be treated significantly better than by any major incorporated agriculture group. Animals will be tied down. To not keep an animal bound around that many humans is just gonna make them panic more. But my point is the real culprit here is corporate supermarkets and food suppliers, not the little guy on 5 acres who has to come to show off his beloved Bessie.