I have an Astell & Kern SR25 MKII DAP (digital audio player) and I use it quite frequently. The sound quality far surpasses what my phone can produce when connected to any of my speakers or headphones.
It plays FLAC files and any other audio file type you can think of. And it acts as an offline music library when needed (64 GB of memory plus a 1TB microSD).
The better the headphones/speakers I use, the more it outshines anything coming out of my other electronic devices. I use it almost every day.
Good for her, well done! Not as pretty of a tattoo as a well-drawn organic molecule, IMO, but publishing is hard and worthy of celebration when you succeed.