She is a spinster, her fiancée killed in wwi. She is waiting to see former student who is president elect. Her story told in flashbackes. Real tear jerker,

Not a complete match, but maybe Cheers for Miss Bishop (http://www.imdb.com/title/tt0033459/)?

Thanks, but not the one. Very similar but the end of this movie the now old teacher sits in a little room reminising while quietly waiting to see if her former student, soon to be president would remember her