well, I have definite confirmation that Love Shine is Riyu's:
http://www.discogs.com/BeForU-BeForU/release/1460044 (track 6)
and Candy is also hers:
http://www.discogs.com/Various-DDRMA...release/582739 (track 2-07)
and if you'd notice the release dates, '01 and '02, respectively. The english covers were not released until DDR Hottest Party, in '07
I think the reason you couldn't find Love Shine & Candy in her personal dicography is because Love Shine is on a BeForU album as a solo track, and Candy is on a DDR sountrack. (I've looked on all BeForU's albums and Kosaka's albums, but the DDr soundtrack was the opnly place I could find Candy)