She is not legally allowed to drive at the age of 16 and being under the age of 18 cannot legally enter into a contract. The answer is from my understanding, no you cannot insure a vehicle prior to her being legally able to do so.

I would advise against doing what you intend. It's better to spend the money on lessons and getting her to pass her test first. Should you wish to get the car, she cannot legally drive on her own, so better insuring in your name and adding her as a named driver. This is also massively cheaper doing it this way. Once she passes her test, then get the policy in her name and cancel the other policy.