Treat everything with a normal mind. Girls are relatively sensitive emotional creatures. Maybe they suddenly feel emotional when they encounter something. At this time, you may not be able to tell her anything if you ask her, so I suggest you not to ask her what happened, but accompany her to see it. Watch funny movies or TV series, just take her to eat something she likes. Remember not to make random guesses. Even if she doesn't say anything, don't doubt or ask anything. When two people are together, trust is the key