I think Angharad is less likely, simply because there are other nations/swimmers in the mix with proven repeated fast times done in recent years. King, Meilutyte, and Tang have all been sub 1:05 in the last 12 months, and then there's the likes of Aoki, Smith and Efimova who have fast times historically.
Without Kaylee though, Freya goes into the IM as the fourth fastest in recent years and the non-Summer two ahead of her have only done that time on one occasion.
Doesn't mean that Angharad *can't* medal, just that it would be a slightly bigger leap for me.