JJ and Sunshine were flirting/play fighting and Sunshine threw a wobbly after getting jokingly manhandled to the pool, which JJ warned her he would do if she carried on throwing water on him
She thought her vag got flashed - but she instigated the whole rumble wearing the worlds shortest nighty and see-through panties
Sunshine totally over-reacted for whatever reason. She could have taken John aside and had words.
Instead she wandered back into the garden, started to work herself up in front of Mario and whoever, then exploded in the diary room, resulting in an official warning for JJ.
She definitely didn't deserve to get booted for it, as I'm sure we've all exaggerated a situation at some point. But clearly JJ has a following

.