tbh 17 years is too long for a reference. She may not even remember you at all, considering the vast amount of people she must have taught. Plus what could she write in it? Even if she remembers you , how would she remember your work? what credence could be given to a reference for your work of 17 years ago anyway. As for a personal referece, she knows nothing about you. You could have been in pison for murder for the last 17 years for all she knows. Even what she does know of you (got bullied, upset, couldnt go out of the house for 17 years) dosent bode all that well for what she could write n a reference.
You must think of another referee