Maybe she moved to Germany.
In 1891 they divided de inheritance of Hendrik Bax and his first wife Grada Leijgraaf.
Persons in this document:
Willem Bax (son of Hendrik and Grada)
Mathilda Wienen, wife of Hendrik
Cornelis Bax
Jan Schreven, husband of Anna Bax. He was also "lasthebber" (how do you translate this?) for: a. Piet Bax, living in Goch, b. Frans Keunen (Reunen?), husband of Maria Bax, living "aldaar" (also Goch?), c. Mathijs Erkens, husband of Margaretha Bax, living in Cleve.
Hendrikus Jacobus Schreven, husband of Gerarda Bax.
https://www.openarch.nl/ran:57FB8B6A-1D42-4964-B94C-754FE6CB3F6A