Although she is a member of the Titans and is fiercely loyal to the scheming Paptimus Scirocco, she still retains a good heart and conscience, which causes her to empathize with the AEUG.

Spoiler

Unfortunately, her devotion to Scirocco turns to obsession and it ultimately causes Sarah to suffer the same fate as Lalah Sune during the One-Year War.

_Source: Gundam Wiki_