Take a deep breath... now that the spider is eaten
Gliders do eat spiders in their natural habitat, and australia has the most venomous spiders of the planet, the thing is that the venom is dangerous only if injected, not if eaten.
One spider should not harm your glider unless the glider's been bitten (or the spider was poisoned by pesticides).
PS : for the record, we (humans) do eat dozens of spiders each year without knowing it while sleeping.