does anyone else think sydney is well.... weird?

in blood promise rose notices that sydney doesnt really eat anything and that she has weird sleep patterns atau hardly sleeps... there is something up with sydney that we havent been told yet. and just some of the ways she reacts to stuff, anda know there is something up with her. if anda re-read the beginning of blood promise you'll understand it better. we've just been so worried about all these other characters that no ones payed attention to sydney.