If the school superscores, then its OK to go in with that strategy, however at some point she will have to prep for EBRW.
I’m not that familiar with the new SAT super scoring rules do they superscore by section or by ebrw total? Is her weakness the reading section or the English section or both? She should practice at home the English section which is generally easier and see how she does. It’s like 35 minutes to 40 minutes max.