The existence of coincidences in the world was still quite unbelievable to Thesa. She was doubting the identity of the girl she had run into one second and chatting happily with her the next.
Sarah has the same name and demeanor as her ex-friend, who dumped her when they were in university simply because she gave her good advice but chose to follow her other friends' advice.
Thesa couldn't believe the Sarah she was speaking with was the same Sarah she had played with for a semester or so at university.
She has many reasons to do so; this Sarah appeared to be very young, and her body did not appear to contain any Botox or to have been surgically altered.
Sarah was pleasant to talk with, and Thesa enjoyed conversing with her. Sarah was more mature, which piqued Thesa's interest.