Who is Lindsey Lee Wells from An Abundance of Katherines and what is their importance?

Lindsey Lee Wells is the seventeen-year-old girl that Colin and Hassan meet when they stop to see the grave of the Archduke. She works behind the counter of the convenient store, but she is also the tour guide to the grave. Lindsey is also a paramedic in training, so she fixes Colin's head wound when he falls on the way to see the grave. Lindsey has a boyfriend whose name is Colin.