So, how does Condy get to Earth A and B? Was it similar to how Jack went from Earth to the troll's session using one of the meteor base things?

It could be a Station, but even then it still leaves you wondering how she got from Earth A to Earth B. It’s something we don’t know, and while it could be LE Shenanigans, there’s also the possibility the Cherub Portal from Hiveswap is involved in this.