Her teeth are all up to date, no problems there.
She does grind only when she's nervous or excited, it's not like she does it when she's turned out or when I'm grooming her or something low-key.
An example of a teeth grinding situation could go like this: we're out on the trail and she sees something she's not too sure of, she'll stop, sniff it, give a few grinds and continue walking. Though sometimes the grinding will go on for several minutes after we've passed the scary object. I always do my best to talk to her, pet her, etc. when she is nervous about something. Usually it takes a minute of observing, a little sniff to make sure it's not going to turn into a scary monster and eat us both, and then we're off.