K.L.
I wish that no mother would ever hear the phrase, "She can't control her children." It isn't that mother's do not need to take control from time to time. But, the goal is not to have control of your child. The goal is to take advantage of every oportunity to help a child learn self control so that the need to 'take' control occurs less and less frequently. The most effective parents learn to look at challenging situations, like the ones you describe, as teachable moments. If the parents see situations as 'out-of-control moments', they are left feeling defeated and frustrated, which often results in more aggressive approaches to 'taking control' or just giving up.
One of the most important things learned in early childhood is to develop the understandings and skills necessary for self control. The fact is that, if a parent maintains the goal of 'controlling' their children, they tend to micro-manage them. The result is that the child either develops the habit of being controlled and relying upon the approval of others, or he/she becomes increasingly rebellious. In order for parents to do this, they must first reorganize their thinking and their habits as parents. This means that it is not only a 'teachable moment' for the child, but a 'teachable moment' for the parents as well.
Even when teaching a child to be obedient, it is necessary to help the child recognize that she/he is making the choice to obey, that obedience is a powerful skill to have, and that there are benefits to exercising it.
The book I continue to recommend to parents everywhere is The Family Virtues Guide, by Linda K. Popov. You can learn more about this book and helpful talks on CD at www.VirtuesProject.com. On this website, you can read about the 5 basic strategies for helping children develop character skills (virtues). The book and/or the CDs can help you better understand how these strategies are put into practice and develop a clearer focus on the nature of the parent/child relationship.
When our son graduated high school, I said to him, "When you were born, we thought we had so much to teach you. But, looking back, all we can see is what you have taught us." No one learns patience by sitting and meditating about patience. It is not learned unless someone is jumping on your last nerve and you reach for patience in the challenge of the moment. Our children teach us patience. So reach for whatever peace and contentment you can and let yourself resolve to maintain a humble posture of learning as a parent. You will develope marvellous skills in the process and your children will be blessed with an observant and competent mother.