I Don't Get Along With My Mom

It's hard at times, though our relationship is improving. But earlier she freaked out on me just by drinking coffee and said that I ignore her advice to not drink coffee and started saying she doesn't exist to me and that I laugh at her. WHHYY?? I tried to stay calm and not get mad so I said sorry. I don't like her moments like these. Lately, she has been in a bad mood and I just broke out in tears because I couldn't hold it in anymore.