The Explore might give a pretty good sense since the scoring is appoximately continuous with the ACT, but the Explore has a hard ceiling at 25. If you look at your daughter's scores on the Explore and add about 2-3 points per year, you can get a ballpark estimate of where she will be. This is not set in stone of course, but it is a start.

If she likes tests, you might want to give her a practice ACT or SAT just for fun and then score it yourself.