I am looking for information of my 2nd great grandmother, and possibly more on my 2nd great grandfather.

I’ve yet to find any information or records proving she even exists other than her name being listed on Canadian marriage records of a couple of her children’s marriages. I’ve exhausted searches time and time again on ancestry, family search etc been on various European genealogy websites but I believe I’m missing something or am lacking knowledge in some area that’s made me but a wall. I appreciate any help possible! And I apologize if I wrote this in a jumbled manner :)
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HUSBAND:
Wilhelm Lentz
1869 Poland/Germany -1946 Alberta Canada

Wilhelm is said to have the full name Wilhelm Gustav Friedrich Lentz but I have reservations this is accurate, especially in regard to order.

Confusing potential parents of Wilhelm I’ve seen others post without proof are Karl Wilhelm Adolf and mother Marie Mierke but her birthdate is earlier than Karl’s so maybe she is his grandmother, I’m still speculating. Another name for Wilhelms mother I’ve seen is Wilhelmina Rosentreter which I think is interesting due to the two sisters I’ve seen for Wilhelm being Augustina and Rosalie to married a Johann Rosentreter. There maybe a third sister or even more siblings or half siblings I’m not aware of or maybe some born out of wedlock, but I’ve had much difficulty piecing it together and am posting in hopes for some help, tips and advice to help me better understand and research.

Wilhelms 2nd wife was Emilie Greening (Gruening)
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CHILDREN :
Mathilda/Mathilde
abt March 1893 Russia/Germany? - 1947 Toronto ON Canada

Ludwig Louis
1891 Russia?- 1972 Braeside, ON Canada

Heinrich
1898 Russia/Germany? - 1970 Alberta Canada

Otto 1903-1905
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Please bare in mind some of this is not confirmed and I’ve been unable to locate any records of Henrietta at all, the other name Agata/Agathe shows up on on marriage record of one child and Henrietta on the other. I’m also partially knowledgeable of the languages and border changes etc and am still learning so please be kind!

I’m still piecing together potential birth places and trying to locate records. I also am trying to understand possible reasons Henrietta passed in her 30s. Should any of the potential records be Russian I have absolutely no idea how to read or navigate that. So tips, resources and links are welcome!

Main focus are Henrietta and one of her daughters who’s my great grandmother, Mathilde Lentz

Thanks in advance!