I dont know how if happened but i think it was when she was running on the wheel. and her tail maybe got caught on something??? I heard it was ok if it falls off since its supposed to be a defense thing, and i found the other half of her tail, what do i do cuz her end of her tail is bleeding(not dripping). My other gerbil is ok, shes clean so she couldnt have anything to do with cutting her tail off, so do i clean the tail or something? Shes only like about 7 months old, (the other is younger) and she seems to be acting normal which means she fine.

Its probably using its defense mechanism
so its probably okay
unless it starts acting ill or something
but just clean it and hopefully it should be okay

best of luck

The same thing happened to mine and she was fine. Maybe take her to the vet if you feel you need to but I think she'll be fine. What happened with mine was the end of the tail grew back and covered up the scab on the end so it was then a stub. She should be ok. If you want wrap it in a moist paper towel