Dahe.

I took some time and searched on ancestry.com Christine Dahe's name. And yes, I got something!
Here, I copy pasted it all.

View Record Preview Name: Christine Dahl Age: 25 Estimated birth year: abt 1895 There's more to see A picture of the original document And things like Home in 1920 Birthplace Relation to Head of House Spouse's name Father's Birth Place Mother's Birth Place Marital Status Race Sex Able to read Able to Write Household Members Sign up now

Christine Dahl [Christine Dahe]

name

city, Adams, North Dakota

abt 1895

location

race

As you can read, it needs someone to sign up to find all that. But to sign up, you need to pay. We have a problem with that :P But, through Christines description, it seems that if the story was set in the 1880's, this Christine wouldn't have even been born! But maybe Leroux changed the dates a lot...But still, we don't know. And this Christine is in the states, and in Leroux's book she was in Europe. More updates soon.