I’m at a HS abroad, so visiting is a costly and time-consuming endeavor. Most students consider the expenditure of $2000-3000 worthwhile only when they’re deciding between 2,3 or at most 4 schools to pick the one they’ll be spending $250,000 to attend over the next four years.
If your daughter doesn’t want to do a lot of visiting, and knows what she’s looking for in a college, I’d suggest visiting only once she knows what her choices are come spring. If she isn’t quite sure, a few trips can’t hurt.