Can a mother be both parent and a friend to her child?


Yes! My mother is one of my best friends.
I understand that people will hesitate at that - they'll say that children have enough friends, that they need parents. But who says you can't be both? It's probably the same person who slams friendships between employers and employees, and teachers and students. OK, such ‘rules of engagement' might apply to these latter examples, but surely there's more to parenting than power?
People can confuse friendship with loss of authority, but that's a mistake - the real power in relationships comes from seeing others as individuals. Your child is a person in their own right.
Children will never be forced to lie to or keep secrets , when made parenting easier. We have to keep the lines of communication open by seeing the world through their eyes, without reproach.
The theory becomes true, when they feel safe to reveal because they knew the mother's interest comes from a place of love rather than judgement. Granted, there lies disagreements, but there wouldn’t be a life event where they couldn't share things with their mother, and the sharing goes both ways.
 Parenting manuals are full of advice on the power of apologizing to your small child. In later years, these admissions of error can evolve from forgetting to buy chocolate sprinkles to more adult confessions. This is the gift of vulnerability. Admitting our own regrets allows our children to be OK with their own mistakes and move forward. Being a ‘good-enough mother' is far better for your child than being a ‘perfect.
There is no right or wrong in this but, faced with the choice between the full exposed route, or parenting with distinct limits, I know which path I will choose to walk with my child. And it won't be the sugar-coated one.
The role of a Parent is to provide the child with secure environment in which they can be loved, respected, supported, protected, supervised and disciplined, so they thrive and experience healthy attachment.