So this first image is Kelly dressed in her Mark VI Gen-3 that she received in Halo: Shadows of Reach. Note that she has those light/sensors atop her helmet.
The second image shows her helmet in Halo Infinite with those sensors attached...but you have to equip a faceplate that makes her helmet have a blockier jaw and completely changes the visor to be as it was in Halo 5 with that swoop curve.
So we cannot equip Kelly's helmet as she truly has it.
Also I noticed that the helmet has a crack in the default visor on the bottom right and you can put on a forehead attachment even though there is no mounting plate in Image 3.
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