Might this be them? Date is a little off, but 'Lizzie' could be Valentine Elizabeth and T/D isn't that unusual a confusion to see.
I see in other messages you mention a son Walter George.1930 Chicago census has Charles D. Dappert b. 1867 and Elizabeth V. b. 1868 nr. Walter G. Dappert b. 1897 m. to Gladys G b. 1897 with daughters Betty M b. 1926 and Marilyn J b. 1929.What records (census, marriage + death certificates, etc) do you already have, and do any of them say when she emigrated?
If you have access to an LDS family centre near you I'd suggest looking at the civil registration records from Germany: