This girl... Not noticing her friend doing exactly what she's thinking about at the exact same moment...
I think she notice in the end.I think the whole point of the last page is that Iguchi see Yanase as the ideal cavewoman she want.
I thought so as well, at first, but ending with "...she'll come to me someday." seems to imply that she's still waiting. One can only hope she did notice, though.