Good luck for your exams, Erin! Why not speak to your tutor about this and what they can do if you fall slightly short? That way you may not feel as pressured? But all may still go well as you will have been studying long before your final couple of days so don't underestimate yourself or let doubt win over. Deep breaths, get in there and get into it. Let yourself get into the flow and the worry won't have space in your conscious mind.
You know what it's like at schools, they are virus factories. It's more likely she has caught something from there and if you spoke to the teachers perhaps they would tell you it is going around? Hopefully she will be feeling better soon.