Can I use "deterred" in this context?
Tori ran over to her grandfather, not deterred by the big beard he'd grown since she last saw him.
The concept of being "deterred" by a beard makes perfect sense to me, and I don't think another concept like "frightened" is necessary. It's the most colorful and interesting option of any mentioned. I prefer undeterred to "not deterred" b/c I feel it reads easier, but idiomatically, either are all right.