I see this all the time and if you don't do it right you will regret it later.

If they are sublessees, there may not be much the apt complex nor the lessee can do to them unless she sues them and gets a judgement.

If all 3 are on the lease, then they may be SOL unless the apt complex lets them out of the lease via some kind of penalty fee. I doubt that will happen though because the apt knows that all 3 will likely be out if the majority are leaving anyway.

An honest conversation to the leasing agent may be in order since one of them is not being cooperative. If both of them go and tell the apt complex that the third is not being cooperative, they may work with them. Highly unlikely, but possible.

This is exactly why you have to be ultra careful on who you room with.

BTW, there is no such thing as "renters credit". It's just plain ole credit. If it goes on your credit report, it can and usually does stay on there for up to 7 yrs depending on what it is. Collections are notorious for "renewing" everytime they go to a different agency and thereby starting that time clock all over again. I've seen old apt complex collections totally screw people's credit to the point that they end up paying it out, even when they don't agree with it, just to be able to buy their house or larger items that require decent credit ratings.

Trust me, you don't want to merely leave someone stuck with a lease because it CAN come back to haunt you. A lot of young people say they don't care about their credit right now, but regret that later on in life. I hear it all the time, "that's from when I was young and stupid.....".

Ca-v-er on here is a leasing agent and she may be able to shed more light on this than I can.