Self guided learning about audio processing
Yes, it requires quite a bit of mathematical knowledge, and some understanding of the different AI techniques out there (neural networks etc.).

You could tell her that a good way to go about it is first choosing the form of AI she would like to learn (here you can mention neural networks).

Next, she should try to learn about the mathematics behind the AI form she chose (computers eventually only compute, so there's math in it). For audio processing, neural networks are, in my opinion, ideal because their input can only be a collection of numbers. The key point of this part is thorough understanding of the field, which is necessary for later understanding how to use those tools correctly.

The next step is learning how to convert audio (maybe .mp3 files) to something that the chosen AI can work with. From there it's specific to the AI that she would choose, but the previous step ensures that she'll know what to do with that converted information (for neural networks - train them on that).

It really comes down to the second step. That's the biggest part, and that's where the self learning really comes into play. From what you say, I doubt she'll find it overly complex and difficult.