It seems that "where" here is referring to a quote from the previous sentence. But why did she use "where"? Do native speakers think a 'quote' as an abstract place?
Excellent question. "Where" can be used in situations like to proceed an abstract time as well as an abstract place. In this case you are absolutely correct that the quote is being viewed either as a "time or place" and so we are able to use the term "where". Ex: Remember that Christmas where we didn't get any presents? Ex: There are a few moments where the comedian seems a bit rude. Ex: We are living in a time where, more than ever, everyone has a voice.