Salam - need advice about my daughter's Quran teacher

Assalamualaikum, My daughter has been taking online Quran classes from a teacher recommended by a relative for about three years now (30 minutes, twice a week). She responds well in the lessons and has learned many surahs and can read them, but my husband feels she should have begun memorising the Quran by now. I also thought by this point she might have started to memorise more. She’s been finding the homework very hard. The teacher asks her to write a surah five times twice a week to help with memorisation, and my daughter really struggles with that. Last week, because she didn’t send the homework on time, the teacher cancelled the lesson. I felt that should have been discussed with me first - my daughter was crying and very upset about it. I told the teacher and mentioned that the cousin in the same course receives 45-minute lessons twice a week while we have 30 minutes. The teacher became upset and said I was questioning her professionalism and sincerity. I never meant to imply that. I suggested the extra time might help my daughter, and that writing a surah five times isn’t effective for her because she has ADHD and finds it hard to focus. The repetitive writing has made her dread lessons. The teacher replied that I shouldn’t question a Quran teacher, that she knows best, and recommended I find a different teacher. I’m surprised by her reaction - this was the first concern I raised and I didn’t expect such a negative response. Am I in the wrong here? I feel bad about how it played out and want my daughter to love her Quran lessons, not fear them. JazakAllahu khair for any advice.