You can see if she has a receipt to help determine that it was not stolen.

Also, you can bring your bike to an LBS and pay them to check out the bike condition along with a full tuneup.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle