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I wouldn't worry about fluffing up your fitch, she'll do that herself as she digs & burrows, I find if you put it in too loosely or fluffed up it compacts down fairly quickly & you end up having to add more.

I wouldn't worry about finding pee, when they're so tiny it can be hard to find but if she does have a spot & they usually do you'll find it if it does need cleaning.
She may be peeing in her sand, they often do & it does clump up when damp but then if they dig in it before you see it it will just get mixed in but as long as nothing is smelling I'm sure she's fine & nothing much will be building up anywhere.