Sarah needs to know if she can use her Motorola Moto G to record her voice in an uncompressed audio format. Leo says there's a ton of apps on Google Play that will allow Sarah to record in WAV. Leo has used Virtual Recorder and Smart Voice Recorder. Smart Voice Recorder will allow her to record in CD quality and upload to DropBox and Evernote (which also has a built-in recorder). She should make sure she tests it before she does the interview.
Sarah may just want to pick up a Zoom H5 Handy Recorder because the mics will be far better than the mic in her phone.