I'm a US citizen, currently living in the US. I grew up in Australia, having moved there first when I was five years old. I was married to an Australian woman and we had a daughter in Australia. At the time my daughter was born, I had only spent a few months in the US since moving to Australia, so my daughter wasn't automatically a US citizen. I have since separated from her mother and moved back to the US, and have been here for over ten years.
What are my daughter's options for obtaining US citizenship and/or passport? Is it just a matter of her and I filling out some forms? Does she need to physically move to the US? If so, for how long? Do her options change when she turns eighteen?
Thanks!

