Ahhh... Shaoran lsing his memories.... uhm, first of, I believe they wouldn't make much of a deal T-T (Sakura is the country's princess, therefore very important... Shaoran on the other han.. is just an archeologist) but knowing Sakura she would probably DIE to help Shaoran so let's imagine she goes with Yuuko... Ah... Sakura is strong, but she is not as strong as Shaoran is... because look what he has to face... he has to help his most important person even knowing that theres a huge pssibility that she will never *really* remember him again... that's a horrible burden...
Making that aside, I can't help but imagine the curious scenes that she would have with Moko-chan (xD) Fai and Kurogane... ahhh... xD