The substrate is looking very dry just now. It needs to be moist throughout (not wet) to raise humidity levels.
Are the plants in pots? They'll grow better if they are and also they'll be easier to swap out when Flossie tramples or eats them.
You need to the temperature directly under that lamp at 35C. Have you checked that it is? An temperature gun style thermometer, inexpensive from Amazon, is best for accurate spot measurements.
How high are the sides of the table? I'd be concerned about an escape attempt. They're pretty good climbers. You should consider capping the corners and possibly the edges too.
Hi, yeah it's straight from the bag so a bit dry. I'll get a misting bottle tomorrow and start getting some moisture into it. The lamp doesn't have a bulb so there is no heat/light yet (should get the bulb tomorrow, then I can set up temperatures).
The table is pretty high above the substrate but we'll keep and eye on her. I can add a lip all the way round if neccessary. It comes with a mesh lid so we can cover when we go out etc..