Clamp lore is a mess
Just double checked, apparently she did die, but Clow made a wish to keep her, and as a result, her time was stopped on that brink, and so she had to live in her own pocket dimension (the shop). As a consequence of Clow keeping her alive, Tsubasa! Original! Sakura's father died with her mother (not clone!Sakura but that version of Nadeshiko) and Clow has to leave the cards behind to fix that gap in reality. Also due to that, watanuki came into existence for a couple who weren't meant to have children in the first place, and I'm a bit confused with the next part but it has something to do with clone!sayoran and original! looping! Sayoran taking his spot, then he became the next shopkeeper.
When Clow departed to fix the gap, that left the Clow cards thinking he died, leading up to the events of CCS and clear card. Since we still see CCS! Sakura's original key in her box, that means that this is still quite a bit before the events of xxxHolic and Tsubasa
-if I'm wrong about anything correct me please! More knowledge is appreciated
Soo uhhh, CLAMP fans, you all remember what happened to Yuuko, right?(⊙…⊙ )