Friend upset I don't want to go out on the Friday before finals?

To start, I go to a JMC. It's the Friday before finals week, and about 5 days before I go home for the Summer. My friend, who is in my Company and spends pretty much every day with me, just texted me asking to go to Dollar General for food, and I said no. I'm busy writing 3 essays so I don't fail a class and have to retake it. I stressed this suggested she ask the DnD group (which we both are a part of and has 13 people) and she responded with "I genuinely don't like anyone in that group RN, but do your work no problem. Good luck and don't fail your class." and I feel like she's upset (because this always happens). She said she was starving so I offered some MREs from my collection but she absolutely refused.

I feel like it's an overreaction on her part, and it makes me (a people pleaser) feel incredibly bad. She always wants to spend time with me and I (an introvert who prefers solitude) deal with it but I genuinely want to be alone at times, and she knows I'm locked in on getting these essays done.

I feel like I'm in the wrong, but I know I'm not. Any advice to sooth ruffled feathers?

I should also note that our county is currently under a severe thunderstorm warning and I don't want to walk 1.5 miles both ways in a thunderstorm (nobody in the friend group has a car).

Friend upset I don't want to go out on the Friday before finals?
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