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Why did Serenica going back in time not follow the rules laid out when the Luminary went back in time? The Sword of Light didn't break like it was supposed to, and her saving Erdwin from death didn't seem to change anything in the present day. By all accounts, everything should have been turned on its head. No Erdwin's Lantern, no Mordegon, yet here we are...
If Serenica never died, instead becoming the Timekeeper, how are Veronica and Serena supposed to be her reincarnation?
In a sense, she did die. Her identity and most of her memories were dissolved when she became the Time Keeper. Without those, she was essentially dead. The time keeper having no emotion in her voice, even when remembering the flute, basically means that the Time Keeper is a husk, a mere echo of what was.