Great question! I always suggest that every student tries both the SAT and ACT at home first, so you can see which test makes your child look the smartest. Have her take a sample of each one. Here are some sample tests for you:
Sample SAT: https://sat.collegeboard.org/practice/sat-practice-test
Sample ACT: http://www.act.org/aap/pdf/Preparing-for-the-ACT.pdf
If her scores on the ACT are higher, than I would absolutely have her take that test as well. It's best not to study for the SAT and ACT at the same time, because they way they ask questions is slightly different, so now is a great time to switch to ACT preparation if it will help her overall portfolio to take that test.
Those a GREAT scores, that would make many homeschoolers celebrate! Focus on finding a great college that will love your daughter and be a great fit for her, where she will enjoy living for four years.
That said, many girls do better on the ACT. If she takes the ACT and improves her percentile score, then she may get more college admission offers with scholarships.
If you would like to talk more, consider the Gold Care Club so I can get to know you, your child, and your situation better before giving advice.
My daughter took the SAT twice, receiving 2250 and 2280 (thanks to your excellent tips!) consecutively. Some people have advised her to take the ACT (some saying that her SAT score is still too low for highly selective colleges, others saying that a high ACT score may open doors to additional scholarships depending on where she applies). What do you think?
You may be wondering how anyone can take mommy grades seriously. I know you are worried, but your home-made grades really do matter when homeschooling high school!