Problem: original Ilina still has no playable role... :-/
Not in canon, not in fanon, not in non-canon...
(Three different classifications for XSP works...)
Her role in LSX is to be off-screen, being Tirahnys's eighth president...
That said, there are plans for her and Selena Daria teaming up in 2015 (post-LS) to kill Mi'aro (he dies in April 2015, I think) so... she still has hope...
(A dream team... a woman with three fairies, and an Elemental Royale of Light who is also an ex-president...)
Ilina doesn't have to be canon. Perhaps if Selenic Shadow ever gets updated, it could have Ilina Horton and Shinica Horton as playable characters. If that doesn't work, perhaps the Lunar Shadow Memories series could make them playable.