How in Oblivion did you do it?
The critical components appear to be having no wearable quest items, and stashing everything else before talking to Martin at CRT after the battle. I didn't intend the torch, but in retrospect I think it's better with one.
Right after emerging from the Great Gate, and giving Martin the Great Sigil Stone, she went home to Bruma and dumped her inventory into a chest in her house. Then she went and flashed Martin, who politely pretended not to notice. She then went back to collect her gear and check the statue before returning to CRT and entering Paradise.
Quest items are the usual fly in the ointment. You can't drop those, and need to use the console to remove them (or change their status so they can be dropped). Any wearable is considered better than nothing by the engine, and that goes to equipping a torch if you have no weapon - but do have a torch.