When she came to the US in 1928 she said that she was going to her brother Charles in Detroit. Charles Johannes Fangel was born 16 Dec 1902 in Vejlby, opslag 80 nr 19. He came to the US in 1923 and was going to his uncle Carl Fangel in McAllister, Oklahoma.
From the 1906 census we also find that Carla has these addition siblings. Laurids Jensen Fangel born 17 Mar 1899 in Vejlby and Martha Ovea who was born in 1901 but I can't read the exact date.
I will try to do somemore research for you tomorrow.