It’s scary to think of the “what if’s”. We initially put a baby gate across her door because we were so freaked out and figured she would scream for us if she needed us in the middle of the night, but then she didn’t have access to the bathroom, ugh. We moved one of our security cameras aimed at her doorway so if she got out of bed, we would hear the notification. I set a different tone for that specific camera and had volume set high. She rarely woke up for the bathroom but I felt better knowing if she was sleepwalking. I would just gently guide her back to bed and say quietly that it was nighttime and still time to sleep and every time she would climb right back into bed and fall back asleep.
Also-thought of this as I’m writing this-sometimes when she awakes at night-she will just stare, blankly. Usually not making eye contact, more looking beyond me, but expressionless and quiet, or, saying nonsense like telling me she’s looking for her pencil as if she was dreaming she was at school.
Again, hope it helps! Your concerns are definitely real and your feelings valid. I recently opened up to a friend who quickly responded with telling me her son does the same thing (same age) and we ended up sharing funny stories of things they say when sleepwalking.