Assuming the comments will most likely be the same, when people say "treat them/us the same as you would other people" take that whole heartedly. Most stutterers Ive met (a hand full" are quite and with that we observe alot so most of us notice the changes in peoples attitude and things like that, especially in a case like this where overthinking and nerves would take over for some of us. Everyones different some open up other stay closed until they are completely comfortable, but ask her about her stuttering and what you can do to help. For example like not finishing her sentences or not looking away while she is stuttering as she will notice that.