Can't read the whole bubble but because she said "Shitty hyuman" I believe she's (ahem) this little shitbag is blaming the human for killing its sister.
Bah their own kid kill her sister and the family think this was human
Yupi~ Yupi~Even though Marisa has tolerated them so far, Marisa has reached her limit nanozee! Now Marisa has no choice but to punish shitty human noze...This is shitty human's evilness! They even took away the easiness inside Reimu family's easy place!!Yua~n
Shitty human... Punishmench?
Reimyu will pwunish too...