Normally letting people have the birthday pick on their birthday week is a lovely last minute surprise. In this case, apparently FilmiKudhi has been counting on it and planning for it for weeks! So I expect her to have her choices locked and loaded.
Common sense limitations: has to be available easily streaming, with subtitles, AND at a standard length (like, 70s movies tend to have a 20 minute variance between different services)
Also, nothing that is a downer, so even if you really really want to pick something like a tragic story of female infanticide, I won’t let you.
Otherwise, sky’s the limit! Pick a movie, pick a day, pick a time!