My Elincia, any changes I should make?

I believe she is +Atk / -Def, perfect IV’s.

It's not entirely bad, per se.

With L&D her base soak becomes 53/59 and but she's doubled at 48, and with Swift Sparrow she has a soak of 58/64, but on defense she's doubled by anyone at 43 base speed, which is not too hard nowadays.

Basically if you run L&D over Swift Sparrow you won't have as tough a time tanking fast units, but a bit of a harder time tanking one-hitters. I often prefer L&D, due to usually being able to survive a single hit to put me in desperation range, but it's mostly whichever you choose.

Oh, and if you are against greens those numbers go to 56/63 and 63/69 with the same speeds, respectively. 49/54 and 53/58 if against blues.