She'll be fine tonight. Tubs are never built airtight to the shelf above them. If you can slide a piece of paper between the tub lip and the roof, that's also an air gap.
Check ventilation by looking at humidity. If you have the tub with heat empty of damp substrate except for a water bowl, close it up and see if the humidity spikes. If you get condensation or 90% just from a water bowl, not enough air flow.
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