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Ok so I been wondering this question for a while, and I only read the end (2 sentences) of summary of Punishment 39. And the person who wrote it said that she didn't marry Schwartz because she was forced to marry the White Knight at that time instead of him. So she gave Anis to Schwartz to take care of. Aww that's so sad, they were all lovey dovey in the chapter where Anis's was introduced. Also, she was crying when she gave Anis to Schwartz. And Schwartz was upset. She was taken by forced from Schwartz by the way.
<---- Anis's mother again
Here is the link where you can read the summary: Tatsukida]