Hello Aidan, normally I would say if there is still some green left, there is a good chance..but since it has no leaves..try to feel the trunk of the tree, does it still feel solid and firm to your touch? So for now, just try to keep it warm as suggested already, and wait if it will bounce back when better conditions return. I have found rubber trees really thirsty plants if the ambient temps are warm to hot. Not knowing at what temps your plant got overwatered or if it was also exposed to too much cold, then that will be a different situation.
Hope your plant recovers, good luck
