I have to disagree with some of the comments. First, it will be almost impossible to speak on the phone with the Head of Year, who will be busy, possibly working from home, and not able to discuss a pupil with anyone other than the parents.
I do understand your concern, as I have a grandson in the same situation. He is in Year 11 and has done very little work. He is very bright and thought he could swing it in the exams. Now he has very little time left to impress his teachers and produce quality work which might just lift his grades. He risks not doing well enough to be accepted on A level courses. I don’t know what the answer is. When I have talked to him( and I warned him at the first lockdown that there was no certainty about his exams and it was important that he complete all his assessments), he made all the right noises but did nothing to follow it up. His parents have given up.
I don’t think it is right to say don’t pressurise the students, they need to keep up. I agree that there are various ways and means of support, but the girl needs to be willing to engage with them.