What does “I’m fine” mean?

I asked someone today how she feels and she said : I’m fine. Does this mean she feels ok or something else?
Updates
+1 y
Thank you everyone for answering and giving your feedback. I did give her space and we talked a bit today. Can’t be sure how she feels but I hope whatever was the issue isn’t going to be persistent.

Should I ask how she is or just act like nothing happened this weekend?
What does “I’m fine” mean?
Post Opinion