The strategies in this thread I would usually teach only to students that are at about a 700 or above. I suspect that Xiggi’s formula will still be useful to know for the new SAT. Counting problems will not be on the new SAT, so you can disregard anything about permutations and combinations. In general I have gotten rid of some advanced strategies that were useful for the old SAT and replaced them with new ones. Most of the basic and intermediate strategies I teach are still the same, but they are now being used for different types of problems.
Based on your daughter’s PSAT score it seems that with some prep she may do much better in math on the SAT than the ACT. I would guess this is due to the fact that she has been exposed to Precalculus recently.