... *sigh* I suppose.I don't know. I, for one, would like to find out, because if she just had demands she could've made them on the bus herself or through Kirika. She didn't need to burn Sayaka's house down first.
Though I would actually consider it more likely that that's evidence for her not seeing far enough to know we were going to try and kill her this week, than that this isn't something malicious.