I was a sleepwalker growing up. I really don't think my parents did anything other than barricade the front door so I could not actually leave the house. We would actually laugh about incidents because my behavior was bizarre.
I walked into our living room when I was about 8-9, right past my parents on the steps...sat on the couch and stared at the blank tv screen. I walked into my cousin's bedroom when we were at the beach and started screaming that I knew she took my stuff, after my "rant" I turned and went back to bed.
As a teenager I had some troubles at home and my sleepwalking spiked up again. I slept in the attic at my dad's house (made into a bedroom) and I would wake up in his basement - 3 flights of stairs below.
I also talk in my sleep, mostly not making any sense...I still do it.
I would maybe try to see if there is a "root" to her sleepwalking (stress, anxiety about something). Talk to the pediatrician and see if they have any advice.
Although I grew out of the sleepwalking I still talk in my sleep when I am overly stressed/anxious about something.