Ask her if her coaches have done "mini-meets" during practice. Our gym does them - the girls take turns doing their routines, and the coaches score them.
As coaches of Level 4, it is the coaches job to discuss what sorts of scores each girl should expect. As my daughter's head coach just told me (my second daughter to go through Level 4) - their job is part athletic coach, and part counselor. Also, the in- house meet is meant to get them ready for competition. You really shouldn't have to discuss too much about scoring with your daughter.
Most of the time - I try to help my daughters set goals that THEY can control for the meet. Scoring is very subjective, and it's best for your daughter to not concentrate on the score. Remind her that for some errors, the judges can take UP TO 0.3 ( so that they can take 0.1 up to 0.3 for certain errors).
Help her set goals that she can control, for example - for beam - holding her handstand for a full second in vertical instead of going up to 3/4 and just tapping the toes, or for bars, keeping her arms straight on the front hip circle, or sticking her landing without taking a step, or on floor, staying with the music.
Good luck at her first meet!