I am your wife's height and a bit less in weight, about 10 pounds. I am not sure if you got the Sport (cockpit depth 11.5") or the Expedition (12.5"), but if those are interior to interior height measures it'd be a little tall for my tastes. The cockpit dimensions look big to me in width, at 18''x 32.5''. It is hard to gauge that without knowing where your wife carries her weight though. Personally I prefer a 16 inch wide cockpit, but maybe it'd fit your wife well enough for good control. It is hard to say unless someone sits in a boat.
My bigger concerns are that the Delta boats are ruddered. Rudder or skeg can be a strong preference and it is unclear whether you know what your wife's is - and the 24.5" width. The narrower Delta 16 is more of a full out sea kayak, and likely faster.
I guess my biggest concern is that you may not be much ahead of the folks on this board in terms of knowing her preferences for a kayak. It might be safer if you can get back to the store and work a deal to trade that boat up for something longer and narrower if need be. Just don't get it wet in the meantime.
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