I like the music, but if they’re going back to the studio then for the next tracks I think they can experiment with a bit more stereo width. Everything feels very centred, and it was in stark contrast to the track I paused on my iTunes.
For next time, I suggest that she grabs some headphones, and constantly switches between their EP and a commercially mastered CD, to give her a good idea of what to aim for.
Please take this as constructive, I enjoyed the music itself, and that’s the best place to start.
EDIT: You know what, it’s much much improved in the last track. Possibly because of a lack of drums.