This is very largely individualized, the best answer is really if she feels she needs to. Does she tolerate dairy well? The reason people cut it out is to ensure no extra water retention/bloating. Personally I cut out dairy in the second half of my prep, but it bloats me and adds some water retention. Many competitors leave it in the entire time with no problem whatsoever. Maybe drop it peak week just to leave nothing to chance? Dairy obviously has numerous benefits and it a great source of protein, so unless she has any digestion issues with it, which is sounds like she doesn't, then no reason to take it out. My wife recently completed her first show and we kept dairy in the entire time with no issues all the way until peak week.
IMO dropping sodium is a good way to come in flat and smooth, and will have a noticeable impact on performance. Sodium intake should remain consistent throughout the entire prep. Especially as she gets leaner and more depleted, she will need sodium. I'm less than 2 weeks out of a show and recently raised sodium quite significantly and feel, and look, much better. Just my .02!
Best of luck to her!