
Quoting
Justified Force
My point is that they can do whatever they want within the law and that includes getting married and that includes leaving the state. Yes they can wait until they're 19 but that doesn't mean they have to and in the OPs latest post he stated that he didn't want to use that option and if they don't want to use that option that's their choice. In the OPs last post he did say that he was planning to go to Colorado with her and as he has not yet posted an update there is no way of knowing exactly what they did but there is no reason to say that they didn't go to Colorado as they planned.
And no I don't know every 18 year old in the world and that's why I don't stereotype and make assumptions such as saying 18 year olds aren't ready for stuff such as marriage. Whether or not they're ready depends on each individual 18 year old as every 18 year old is different.
Anyway, as of now there is no way to know what the OP did as there has not yet been an update, it will be interesting to see how they work it out if and when the OP ever does post an update.