The original name of this comic is "Single mother".
A single mother (Reimu) and her child (Marisa) found their new nest, but a small Alice was ther to wait for her mother. Although they had been watched, they killed Alice and took it over.
She (Reimu) said that she should be treated with kind because she was unhappy, and she believed she was perfectly correct.
As you guys expect, her argument was ignored and attcked. Marisa noticed that it was impossible to escape, and she ate her accessary to disguise herself as Alice.
Reimu said "Die" to Marisa after disguising, so Marisa attcked her mother Reimu. But After that, Marisa heard somethis she shouldn't listen.Reimu said "Die, Alice.".
Marisa noticed that she wasn't recognized as "Daughter" by Reimu anymore. She broke into a run from Alice's nest to escape from reallity...
I'm still not sure that Reimu knew Marisa disguised or not, so I can't say that Reimu recognaized Marisa as a traitor or not.