first, teenagers do struggle with early mornings generally as has now been proven by controlled studies.There is a strong argument that older teens should start school later around 10am form some quarters. It has to do with the surge of brain development taking place during puberty.
theconversation.com/the-biological-reason-why-its-so-hard-for-teenagers-to-wake-up-early-for-school-88802
so, it may be helpful to share this with her , and then discuss if she may, through that, have got into habits of late wakening. But now she through that puberty part, she should be able to train herself to wake earlier and not feel like death warmed up.
then work with her on establishing an early rise in these last couple of weeks before she leaves- get her to switch her body clock forwards but going to bed unusually early and maybe using something like Kalms or even antihistamine for a couple of nights to help her break the cycle.
sure, equip her with alarm clocks of her choice.
BUT, then leave her to it. She is an adult and has to take responsibility for getting herself up. If she misses lectures it is her money she is wasting and her future she is jeopardising. Bear In mind she will not be the only one struggling. I had a mate at uni who was useless at waking, I’d bang on her door loudly on way to breakfast to help her. She’ll probably get disturbed by noise of other students stirring and crashing around grumpily in the morning .
my eldest DS was terrible at waking. Even at uni. but I left him to it and it was his problem not mine. He did get his shit together by 2nd year, and now, at nearly 30, wakes early and is never late for work. As I say it’s a combo of how young peoples brains are developing, and habit and they do, in most part, learn to manage or grow out of it