When a bossy middle age woman is accidentally send back in time on the day of her second marriage, she must seduce and inspire the young Genius slacker who will invent time travel: her future ex- husband.

I am adding the fact that she is getting married to introduce some time constraint. Also I made her a bossy women to create a bigger opposition with her slacker first husband.

I can see a great comedy based on that concept. it has multiple sources of conflict: age (unless she was much younger than him, she is now the older of the two), character (bossy women vs slacker player), time (she is aging in the past missing her life while he is living his life), era (she is used to today’s technology, …), …

I like the idea that because of the wedding, she has had a nose job, a different hair style, so the first husband did not recognise the women who inspired him. Because of him, he became a successful business man, but he ignored her need and they drifted apart. Now on the day of her remarriage he then recognise her and try to explain and accidentally sent her back in time. Hoping that on her return they can rekindle their love.