It is very natural for parents to have different views on child rearing. Sometimes the mother may be too strict while the father is lenient. Other times the father may believe in spanking a child who misbehaves while the mother strongly opposes this. So how would two parents, with completely opposing points of view, come to an agreement?
Very often when children don't get permission from one parent, they rush to the other. In such a case it is important not to overrule a decision once made. If your partner has denied permission and your child comes wailing to you, ask your child to sit back and reflect on why she thinks she has not got permission, and what she can do in the future to ensure she gets it.
Similarly, with friends
If your child comes running to you because she has had a fight with her friends, don't rush in and fight her battles. If you feel the fight was very serious and warrants interfering, you could have a word with the parent of the other child in question.