I haven't reread Edinburgh but the explanation will probably be that she is weakened but can survive because she is royalty. Or it could be a Merlin item indeed.Weren't vampires supposed to be vulnerable to sunlight? I thought that's why Gelda covered herself in darkness the last time she was out and about during the day. Then again I think that ability was turned off when she entered Zeldris' mind so maybe it's not that serious.
Now that I think about it, the go-to solution for almost every problem like this is always some kind of an invention by Merlin. Want to make babies with your much smaller husband? Take some shrinking pills. Need to prevent the sun from activating your magic? Just wear glasses. Perhaps Gelda is wearing anti-sun contact lenses that put all the sunscreen manufacturers in Britannia out of business.
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Orlondi could survive as an eyeball couldn't he? Or was it night when he found Arthur and Nanashi?