is there a right age to give a little freedom to your growing up kids?

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yesterday my daughter ask permissions from me that she will watch a harry potter deathly hallows movie with her school friends since i know them i let her go but i accompanied her to the place yet she told me its exclusive for her friends because all of them without mom and nanny tagging with them.I want my daughter to be independent coz she is already 12 yr old and in fact she my only daughter however i feel that she is not old enough to do that but i want to trust her yet i had fear that i cannot explain.for me my daughter is still my baby but its a fact that she is growing up and she could have sooner or later her own peer group that not all her time will be for me as her mom...this is now my fear of all what my friends keep telling me before that we have to take all the opportunities when they are still babies to hug and kiss and be with them most of the time.yesterday i still waited for her until they finished watching, they eat and stroll inside the mall i did not tag with her i let her enjoy her little freedom from me and her nanny, but i feel sad that sooner my baby girl will be independent and will have another life.. i only sigh that wow how time flies so fast that my baby girl is now asking her freedom and independence..do you think i did a right move allowing her watch with her friends or giving such freedom for a while?