Thanks everyone for the advice,

I covered both sides of the screen lid with aluminium foil with space for the lamp/ air ventilation in the middle. It hasn't done much but I'm keeping it there as I've been recommended it plenty.

Yes, currently she's in a glass terrarium. I'm dead set on not keeping her in a plastic tub. I like being able to see her and monitor her without having to take off a lid or disturb her. That, and the idea of heating pads on plastic scares me.

So, if I was to put the ceramic heater BACK in, and just put the moss in both her hides, that would be sufficient moisture instead of air humidity? I've hear they can get repository infections if the air is too dry