A lot of college coaches offer pitching clinics in Dec/Jan, if your DD is interested in a school it is a great way to get her in front of the coaches, so I would start there.
PS - some college coaches offer pitching clinics off campus, so reach out to the coaches and ask. My DD's junior year her TB coach helped coordinate a couple of pitching clinics in Atlanta by various college coaches.
Don't rule out D2-D3 Schools.. My DD just attended two Pitching Clinics at Millersville in PA. D2 school but head coach is former Pitcher and for $30 each for a 90 minute session we thought it was well worth it. We live in PA and this time of the year it would cost $50-$75 for 90 minutes of gym time alone!
I'm biased but, I'd go see Bill Hillhouse. You can see his schedule on his website. While I know he does some clinics, I think most of his weekends are 1-1 lessons rather than group clinics. I know people book 2-3 lessons (private lessons) with him over a weekend. And he gets a lot of people who travel in from different parts of the country, from what I'm told. He has told me that Dallas is the biggest group of students who come in from all over.
I'd be happy to help if you wanted to travel to Dallas, I do get a lot of people from all over. contact me here: bill@houseofpitching.com if you're interested in Dallas. And keep checking my site as new locations pop up all the time.