“No more there are, indeed. How very provoking! But I think we had better sit still, for one gets so tumbled in such a crowd! How is my head, my dear? Somebody gave me a push that has hurt it, I am afraid.” (Chapter 2)

I do not know all that was done to dress and groom a lady of that time in general but in Chapter 2 of my Norton Critical Edition there is a note about this quote, particularly what Mrs. Allen means by “How is my head.” The note says: Hair dressed in an elaborate manner with pomade, powder, ribbons, etc. I think this kind of hairdo does take a while to fix up so probably that was a big factor and JA blames Mrs. Allen also because earlier in Chapter 2 the narrator says—“Mrs. Allen was so long in dressing that they did not enter the ballroom till late.”

I do not know why Mr. Allen does not introduce his ladies to anyone or ask the MC; perhaps it is not appropriate or he did not see anyone he though eligible or perhaps he forgot. It is a quiz, is it not? :D