#avoidant behavior

My gf and i have been dating for 4 and a half years and things have been good lately up until today. For some context shes in nursing school and im currently on a internship. She has a new term every 4 months and for the past 2 terms when she’s had a final she asked to go on a break. The first time we went on a break it wasnt really official and lasted around a week and a half and was because of intimacy issues where ours didnt really align where shes rarely into anything intimate to the point where we went without sex for 4 months but since then ive been ok without it and having it not often. The second time, last December, she was mad that i didn’t get her flowers often and she said we need to reevaluate our relationship because we want different things which lasted around 2 weeks. And now comes today which will be the third time as her finals are in 2 weeks. Today she woke up and said she scheduled herself to work 2 days at the hospital on the weekend and was tired and didnt want to work. I responded with “Ur not working -.-. And u dont even have school this week” as she hasnt had class the past 2 days and today her class got cancelled and tomorrow she was going to skip. I know this wasnt the best response in hindsight but she responded with “I cant be tired? My bad.” I didnt mean it that she cant be tired and now she says she will see me in 2 weeks. Ive since apologized but havent gotten a response back. Im not sure what to do since im pretty sure this isnt something that happens with most relationships where you go on a break whenever someone is stressed. I feel like shes looking for a reason to go on another break or something and im not sure what to do. Any advice is greatly appreciated. What can i do from my position?