Poor Nena! You must be very relieved. I'm happy for both of you that the doctor was able to get the grass out.
I think that is a Foxtail grass part, and they can cause so many problems getting in the eyes, nose, mouth and skin. If you can, avoid areas where you see them.
Foxtails: Why They're Dangerous for Dogs
Wishing Nena a speedy recovery and hoping you can catch up on your sleep.