I'd probably go with the +DEF and merge in your current one to inherit learned skills/get the +1 bonus.
I think that trading Threaten Defense for Panic Ploy (to nerf blade tomes/horse and flier emblem) would help her resilience tremendously (though it would cut back on her offensive presence a bit).
I run Fortress Defense on my Gwendolyn and have had great success - but if you don't have it you might as well hold out hoping that you pull Seth from the new banner or Lukas down the road. Alternatively, now that Fortress Resistance is a thing that might be the better route. I don't like the elemental boosts myself since they trigger off current HP but if it's working for you why not hold out until something better comes along.
On Sunday, I made a long post about Sheena and Gwendolyn if you're interested.
https://fireemblem.gamepress.gg/q-a/armor-emblem-healer-gwendolyn-and-antimage-sheena
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