P.M.
Could be a combination of overstimulation and sleep deprivation, which often results in difficult sleep, and fear of the fireworks, if she was exposed to that. She might, particularly in a more-nervous-than-usual state, sort of expect her room to explode with light and noise at any moment.
I don't think it's going to set a precedent if you give her the comfort she needs while she's still running behind on sleep. Consider the alternative, which would be NOT comforting her, and how that can go on keeping her from relaxing into satisfying sleep that will calm her nervous system.
I doubt that she's waking because she realizes you're not there. She's waking because she's tense and anxious and not really sleeping well, and THEN she realizes you're not there. She could also be having nightmares that wake her. Would it be possible to make up a bed for you or daddy on her floor, and spend a few nights there? The more relaxed she is, the better her sleep, and the easier time she'll have sleeping.
It may take a couple of weeks to get her sleep schedule straightened out, but if she was a good sleeper before this weekend, she will probably become a good sleeper again.