Well seems that, the Pet Reimu got raped, and went wailing to her owner, the Marisa got crushed and realizing she still had the stalk and clearly the owner wouldn't support babies, well, she dropped them. Surprisingly smart, makes one wonder what level of badge she's.
well we still need the translation, she does have deibu aspects, but, discarding childrens after a possible rape (if it was) isn't necessarily bad considering she's a pet and that her owner may do the same he or she did to the marisa to the reimu if she went into "take care of the children you shitty slave!" we know how "non allowed breeding" in pets ends like.
From the images persentened I would have to say that it went down like this. Marisa raped Reimu -> Reimu called her owner -> Owner smashes Marisa -> Owner tells Reimu that it will be smashed to unless... -> Reimu discards the stalk now -> Reimu discards the stalk