What kind of twisted 'love' story is this? On the second thought, maybe her friends are more likes her pets, wait, it doesn't right either. On the final thought, it's likes a vegan elf suddenly goes meat for the first time since her was born. Taking sometimes to get used to, but meat is meat, it goes through, delectably.
may be cannibal may be not
I think she should only be called cannibal when she eats another mermaid and not just by only her eating some fishes and etc
edit: still, in terms of culture, region and ethics... HOW IMMORAL!!