I could hardly call it a crack ship.
She was obsessed with Rose and Steven is basically Rose 2.0.
She's tried to run away with him and leave everyone else behind.
She watches him while he sleeps.
She blushes at a lot of his actions.
She's called him sweet, considerate, beautiful, and more.
She's always hugging him.
She's always concerned about him and his well-being.
She wants to show him how to be strong in the real way.
She wants to be his rock and light a fire in him.

Plus, age doesn't mean a thing when you're an ageless being.

I don't think that's enough to label someone as a pedophile…

Although, part of it might be because she's an absurd amount of years older than him.

…and that ship actually makes some kind of sense, if you think about it. I mean, we're all pretty sure Rose was Pearl's waifu, and then there's this: