Could it be a timing issue? She feels like she is short on time, hence not answering what the actual question is asking for?
Has she had any tutors for ACT/SAT? Our experience was that the tutor really had insight into timing and test taking strategies, this was the biggest benefit of tutoring for my kids. Stuff like breaking the parts into sections, how much time to spend on each, and determining which types of problems to do first and which to come back to, how to recognize certain types of questions, stuff like that (note this is all ACT based but I believe that SAT prep has similar “strategies”). Maybe presenting the tutor in this way would not be pressuring, as in not to raise the score but to tackle the test in the most efficient way.
I don’t know if she has time to double check her work, but a simple way to check for silly math errors is to read it backwards, as in right to left or bottom to top; so she would look at the 6 and then think “=3x3”.