Still unidentified printmaker represented with 6 square flower colour woodblock examples and these (3) archived other prints. They show up regularly in auctions and she might very well be related to German-American artist painter and academy director Max Hagendorn (1874 - after April 1938).
If the price is right (“reasonable”) I would not hesitate to add more more examples to this collection. The most recent offered examples (late 2022) however are IMHO not (realistically priced). Time will learn.