The Beta Reader's Burden

My friend asked me to beta read her 200,000-word fantasy novel. I told her the magic system was confusing. She sent me a 47-page appendix explaining it. I said the world-building raised questions. She sent me a constructed language with full grammar rules. I mentioned one minor plot hole. She's currently on year three of writing the prequel trilogy. I just wanted her to fix the typo on page six.