I think she’s reacting to all of the stress and pressure of junior year. My advice is to have her take a break for a few days, remind her about test optional schools, and make sure she has a safety school picked out that makes her happy. It may be time to lay off the practice tests, college visit talks, etc for a little bit (not easy I know).
I agree 100% that if she gets a 1400 on a practice test, there is going to be a range of possible scores.