The font is really messy but I'm certain the Marisa is actually still saying “Okyacha!” (okaa-san)
おきゃちゃっ!
“Mwommie!”“Fix heeeerrrrr!”
“Big sister!”
“Can’t she still be fixed!”
“Fix (her)!”
“Such a thing can't be possible!”"It can't be...""...Let's say goodbye to Maricha..."“Pipipi!”
*flap*
*flap*
*slimy*“Yupibi!”
"...You see, Reimu, if you freeze and thaw repeatedly...""The cells in the red bean paste will be destroyed...""Yu...eh...?""...what about the other little one...?"
"...Reimu, the child who exploded is already..."