Charlotte that is like her father, dining at Rosings in awed silence to store information, aware of the connections and the value of those connections:

CH. 29 - "Sir William did not say much. He was storing his memory with anecdotes and noble names."

He is like Mr Collins, in his attitude to Lady Catherine, and thus, it makes sense Charlotte may have this model from her father already instilled:

CH. 29 - Leaving Rosings: "From these instructions they were summoned by the arrival of the coach; ***and with many speeches of thankfulness on Mr. Collins's side, and as many bows on Sir William's***, they departed."

IMO, how I have figured it, it doesn't mean Charlotte is not the sensible person she mostly appears, it just means she has this trait, which becomes more obvious with her union with Mr Collins.