Adele didn't copy Shakira, it's just a coincidence. Just like I seriously doubt that Sam Smith copied Tom Petty or Michael Jackson, these things happen all the time in the studio when writing songs.
Like Lady Gaga and her song Schiebe sound like "It's A Lady's Night" in the verses.
If this is true, then I've lost all respect for Shakira. Adele will walk out of this unscathed and with free publicity, Million Years Ago will still remain the better song.