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Each hen is a living individual with their own personality and instincts. I will not say that each and every one of the many millions of hens on this planet will be a dedicated mother if she goes broody, but I feel safe saying that almost every one that goes broody will be a very dedicated mother. Breed may be a factor. You've been around this forum enough to see the occasional post where a hen did not take good care of her chicks, especially first time broodies. They occasionally abandon the nest before the eggs hatch, may kill their own chicks, may abandon their chicks before they can take care of themselves, or will not defend their chicks from other chickens or animals. I grew up on a farm with a flock of free ranging mutt chickens and never saw any of this bad behavior. The hens we had took extremely good care of their chicks.
I cannot guarantee that you will not get a bad broody, but I do think that if you give Mama enough room to work and take care of her chicks, it is highly probable she will do an extremely good job. You will be amazed at her dedication. If you crowd her into a small space where she does not have enough room to take care of her chicks, problems are more likely to develop.