The group I DM for has hit level 30 and we only have 2 sessions and the big final boss encounter to go. However, one of the players (not her character), the leader, recently left the group and the rest are fairly screwed without their healer.
For the last session, I tried giving her character sheet to the guy who knew her character best, and even though I heavily modified it to be much more managable (among other things, I removed some minor powers, feats and features and I changed a chaotic crit formula to a flat bonus), the feedback from that player was that it was still way too much to deal with when he had his own level 30 character to manage.
What is the best course of action for me? I want her character to be there for the final fights, but level 30 characters are incredibly complex and making one or more players manage 2 level 30 characters is tough. I also want her presence to be more meaningful than just "heal bot", but that's hard without keeping almost all of her powers.
A final concern is the time constraint - I simply don't have enough time on my hands to completely overhaul or reconstruct her as a balanced NPC, especially when I don't have any encounter before the Big One to test her on.