My 21yo dd used Latina Christiana at home for 2.5 years before high school, and in high school took two years of Latin online through The Lukeion Project. LC moved slowly for her, but that was also because I had no experience in Latin and was learning it along with her. I had started her with LC because she asked to learn Latin and that was the program I’d heard of, so I didn’t do much research on it. She took a few workshops with Lukeion (not in Latin, but related topics, as Lukeion specializes in ancient history and language) and then we decided to go with Lukeion for high school Latin. Her experience there was excellent. I can’t recommend Lukeion highly enough.
That said, it’s not cheap, and I would only recommend it if your daughter is dedicated to doing several hours of work a week outside class, as well as being very diligent in showing up on time for class (the classes are online but in real time), as well as turning in homework and taking tests in the time frame required. This was a great way for my daughter to practice the discipline of deadlines and harder academic work than she’d done before. She really loved it and did wonderfully but after two years decided not to continue because she wanted to dedicate more time to other pursuits.
FWIW, the Lukeion courses, though high school level, assumed no previous knowledge of Latin. My daughter said that her LC learning helped her slightly, but if the course hasn’t changed since then, your daughter’s slow pace through PL won’t be a detriment.
Whew! This got long! Hope it helps!