My little brother just shut our kitty in the door...

[Cumulonimbus]

...and now it's barely moving it's back legs. It kinda just drags them around, but if you tickle her feet she'll move them just a little bit. She's not really acting like she's in pain, more or less just semi-paralyzed. The door shut below her ribs, so if anything's broken it'd probably be the spinal cord or spine, at worst. The kitty's about 1.5 months old and I'm hesitant to kill it cuz it's the playful one of the litter.

So, anybody have any experience with this? Should we give it more time (it's been about 3 hours), or am I just not facing the facts here?