it appears she really can sing very well
she can't sing very well. stays on pitch, but her range is so limited and is a very weak singer. i always here the compressors working to boost her volume and she always stays within 6 or so notes in every song.
she writes all her stuff though and is a performer, so that's cool. but definitely not a "very well" singer in comparison to real singers. IMO.
Matt talks to these artists on a daily basis. The quote you have there is out of date. When Matt says Robin has changed to an all Fractal rig he means he has ditched Kemper.
but i saw it on the internet just now!