Hello, What should a recent Giyoret do with her Kelim (plates, forks, knives, oven...). Since all of them were "technically" Kosher before her conversion, can she keep them all or are they Treif because of Bishul Goy ? Thank you

As for Bishul Goy they really need to be Koshered [even if used for only kosher food] however for Toveling there is a leniency of the Aruch Hashulchan not to tovel.