Yes, what is she going on about? Looks like another rock on the local translators' backs.

I believe she's asking how the hell it is that either Senka or Kanae could have the other as a mother or daughter, but I'm not sure. This is a tough one, even if I could fully understand it, I'm not sure I could word it well in English...

I think that's what the last bubble says.
Someone else can check it.

"落とす" in the last bubble means "achieve", I think.

By Rapelay order its the younger sister then mother then the older sister

I think Mobu's talking about flags...

Of the chibi heads in the last panel, Senka's looks most yukkuri-like, what with how it looks like the hair's resting on the ground.