Based on what we’ve seen in the trailers, even decades after the events of the first film, she is scared of him.
For Laurie Strode, Michael Myers is the most terrifying thing in the world.
If you’re trying to keep that fear real by staying in character, then you also can’t hang out between takes with the guys you’re supposed to be in fear of.
On the one hand, the two people who likely spend the most time on camera in Halloween not interacting at all outside of filming seems a bit odd, but if Jamie Lee Curtis was in character the entire time, then it makes some sense.