Unless I'm missing something, this is the same as Lilka vs. Artea, which is to say an easy match in Lilka's favour, if possibly an infinite one. <_<
-Lilka buffs until she's immune to damage, Selan can't stop this.
-Selan's IPs are meaningless, Lilka never damages her until she herself is damage-immune.
-Lilka then wins, at worst, by doing more damage over the resulting infinite match.
Although my guess is she can win outright with doubleturns and enough buffs. Dual-Cast to close things out?