Jelly people?

I was somewhere that was a cross between a school and a resort on an island. All the students there seemed to be female.
I had been sulking around in a hair studio for some reason. There was no one in there at the moment. Suddenly a lady swooped in and after a moment started playing with my hair. As she was doing this my hair seemed to turn a golden blond.
She was trying to convince me to donate my hair to some cause or another. But I said that it would leave my hair too short for my round face.
A guy came in and traded shifts with the woman, and addressed me by another name. I corrected him and he was all "Oh, you're not my one o'clock." I pointed to a girl next to me (the room had been slowly filling with people) and told him that I had just been sulking in there while it was emtpy. I left.
A bunch of stuff happened. And I was suddenly being chased by the lady and one just like her. They were trying to kill me for not doing as the other people were (there was a panic or such about something like the island was sinking. People were gathering to get on some large boats, but I refused for some reason.)
I, with a few other people, managed to capture the new lady, we swung her by her arms and legs and threw her into a little dip in the stone roadways.
The lady EXPLODED, and it turns out one of the people who helped us was the lady who'd been messing with my hair. She was the same as the one we'd just destroyed, and they weren't human. They were something like jellyfish mermaids. They feed off people and couldn't go into the water otherwise they'd be 'reclaimed'.
As we were talking under some stairs, the lady dipped down the join us with the comment "I'd been debating going home anyway." As she said this her skin was turning a dark gray and her hair silver. She grinned at us.
Then I woke up.