Short term; "probable", if going on a lens of 'oh, she just has amnesia, is all!'... At least, until the fact she's resisting (under 'enlightened' ideas, of 'I got another idea to revive Sothis'. Happens... *Pulls off a Miracle*)
She'd likely no longer "think" of merging/having Sothis hijack Admini. The moment she pulls of a "Crystal Dragon Jesus" move, to say... "Revive a Fell Star, out of a corpse?" (Or some, eldritch horror angle, under 'I can't believe it's not Dark Magic! Life Magic?'.)
In which case, Rhea would be hit with a brick joke... And suddenly, very nervous over how to handle a surprise newborn. And what that might mean for a potential revival of Dragons!..
Which ultimately, would be another brick joke before the "Those who Rave Slither in the Dark", become utterly paranoid in seizures, here.