I often wonder how much better I would be doing, would have done if my parents encouraged creativity, ambition, confidence, determination, fearlessness, taking risks, picking myself up, enjoying life, helping others ... They did the opposite, although I am sure they meant well and did the best that they could. Their parenting philosophy is quite Asian as I am coming to realize while I would have been able to relate to a much more Western philosophy and benefited from that. I developed in some ways much earlier (mentally) and in other ways much later (emotionally).
I read this story in the NYTimes magazine about this incredible woman my age who took time off before college, traveled to Asia, and started an orphanage for Nepalese children wandering the streets and she's just 23 now.
http://blinknow.org/ Her parents raised her up with confidence, told her she could do anything. My parents never taught me such a thing, not even close.
Like any children, teaching them about confidence, self-worth, self-efficiency, individualism, compassion are so important. If she's INFP, she's already naturally very compassionate and sensitive to people and her surroundings.
Really encourage her sense of self, her accomplishment and talent as an actress, or whatever else But at the same time, don't let her wander in the clouds all the time. She also needs doses of harsh reality so that as she gets older, she won't suddenly be traumatized and disappointed. She needs to learn that constructive criticism is important for growth and it hurts a lot of the time.
Teach her and somehow show her that while their is immense good in the world, there is also immense cruelty and she needs to find ways to cope/deal with that as efficiently as she can. At the same time, if she falls, let her fall and let her pick herself up. Don't over-coddle. She may seem delicate but she's very strong in spirit.
The more I fell, the stronger I have become over time. I know my self and I know deeply what I want from life and no one can persuade me otherwise. A good, nurturing parenting would have done me a lot of good, but there is over-coddling.
I had a friend who's XNFP who her mother coddled and protected at every turn and she's very detached from reality. Give her a lot of space to build herself, almost brick by brick. Careful not to discourage her from dreams, but also be careful not to let her be unrealistic. A good dose of reality is good. Life is hard for a lot of people, of any types, don't let her wallow for too long. Don't patronize. Let her stand up to you sometimes when she truly believes in something but you don't agree, let her argue and form her logic/convictions. It will be good for her determination.
I hope that helps. I hope one of my kids end up as XNFP and I will try hard not to screw it up. When I worked at a preschool, the very dreamy and shy kids were always my favorites.
I know a lot of what I said sounds like contradictions but there's really a fine balance.
Also...INFPs have many layers. Don't under-estimate, don't coddle!