salma, - you can take the SAT before or after the PSAT, it doesn’t matter and won’t affect her chances for the finalist round. Note that only the PSAT is used for semi-finalist, the SATs come into play for selecting finalists.
@OHMomof2 - you’re right, I over generalized, in this situation though - a single mother working two jobs, seven days a week, I’d be shocked if her daughter didn’t get financial aid.