@james2020 In my experience, the best way to improve scores is to take timed practice tests at home - use official tests that have been retired by the College Board. She can download them on line or get 8 of them in a single volume on line for about twenty bucks. If she doesn’t have big blocks of time, she could do a half test each on Sat/Sun. although I think that doing the whole thing at once is best because that best duplicates the real test when fatigue will set in. After completing the test, it is important to diagnose the errors to come up with strategies for improvement. A motivated kid can do this independently; many kids need more structure from a tutor or a course.
Alternately, practicing on Khan Academy will help to pinpoint areas to improve.
Finally, she might want to try a practice ACT under timed conditions. Some kids do markedly better on one or the other. If the scores are roughly equivalent (you can find the conversion on line), then she should focus on the format she prefers.
BTW, that’s a perfectly good baseline score. Some kids improve a lot with prep, some don’t. If you see leveling off with practice tests, that’s probably a good indicator of what her official score is likely to be.