This might no be a perfect match for the situation you experienced,
but, if the person were a bit more *engaged* in the conversation
(i.e., hearing what you were saying, but not caring),
you might call her attitude [***patronizing***][1]:

>To treat in a condescending manner,
often in showing interest or kindness that is insincere

[1]: http://www.thefreedictionary.com/patronizing