Please help out

Hi, I'm writing a story where this woman (Lucy) is trying to recover mentally from a car accident she was involved in where another person died. She's scared of driving and scared of harming someone again. I wrote this:

Having entered a wooded area, Lucy nears a deer crossing road sign. Her face tenses as she passes it. She turns on the radio to distract her thoughts.

I want the word choices and all to be perfectly natural and fitting to the context.

Is it written OK? Would you change anything? Can I say "her face tenses" to tell that the deer crossing road sign makes her a bit uncomfortable and nervous? Please help out.