Terrys are sized in inches - 16", 17.5", 19", and on up. I used to have one and rode the 17.5" size, which is close to 44 cm (44.5 cm maybe), so that's probably the size she has. The top tube measures right around 19".
Sorry for my cynicism above -- I am just very jaded after hearing about all the bike scams on ebay and Craig's List. That said, I have both bought and sold a bike on ebay with great success!
Emily

