my girlfriend mad at me the week im planning to propose

For context, we have been dating for 5 years now, and we're high school sweethearts. My girlfriend [19F] and I [21M] had a huge fight yesterday morning because I had been watching porn and she finds it disrespectful and I understand but now shes so pissed off at me and doesnt want to speak to me and wants to stay home for our trip. Im proposing on this trip. We fly out in 2 days, and she hasnt packed or come home yet. I've apologized and bought flowers, sent paragraphs, and she isn't budging. What do I do to get her to not be mad?