On mobile, but Junko says, "You watching!?" and "Are you watching!?"
Hecatia enthusiastically thinks something is good. Most likely, just everything in general. Casual speech. I'd translate it as, "I'm good!" or "everything's good!"
I THINK Reisen is saying, "piece of cake" up top. Second panel is definitely, "oh shit..." or "not good..."
We know that she's probably calling Chang'e, but it's not that obvious from just this picture alone. If we go by the rule of thumb, it shouldn't be in the pool.
Are you still watching!?This is bad...It's all good!Piece of cake♪Are you watching!?