I hope this reaches you, Leta! I just did a random search for my husband's grandmother, Wilhelmina Kannegeiter, and saw your inquiry. Amazing! I see that you did it 5 years ago, but I'm hoping you'll still get this.
My mother-in-law, Winnie (short for Winifred Wilhelmina) Terpstra, is one of Wilhelmina Kaanegeiter's daughter. She lives with me now and her memory isn't too great, but we'd love to try to help fill in some of the blanks. Also, I know some other relatives we can ask information of, but they're getting older too, so we better hurry, Darlin'!!
Please get back to me asap if you get this!
Love, dear relative of ours!