If she wants a rigorous enough stats course for it to be valuable for data analysis as a psychologist, she may well want to wait until college, and take the STEM version of stats. I can tell you from experience that grad-level stats for social sciences was far less rigorous than the incidental stats I picked up in STEM coursework.

She should do whatever makes the most sense to her and you for her future goals, but do so knowing the relative level of challenge of the courses.

...pronounced like the long vowel and first letter of the alphabet...