1. Not that difficult at all, Fang has a number of magical pendants that would help with that, though they would have limits and bad translations (think google translate). It is possible to learn to speak in your shapeshifted form over time.

2. With practice and time as well as trial and error, yes, she would be able to achieve this.

3. It can be either, but flight won't come naturally with the wings, they will have to learn that skill from scratch.