[Ritual Path Magic or Path/Book] Life-sustaining warmth ritual

[Icelander]

I need to know how to write up a ritual that kept a terminal hypothermia victim alive. The caster was untrained, using Wild Talent.

Background: I'm running an 80s horror-mystery game where three FBI agents come into a small community on a minor errand tangentially connected to a major serial killer investigation and become involved in an occult mystery. The title is Cold Night in Maine (link to a GoogleDrive with notes, scenic pictures and casting photos of characters). Here is the forum thread on it and here's a thread on 80s stuff connected to the game.

Maria Lucia de la Guerra Estevez (PC) has Wild Talent with some modifiers, including Emergencies Only, Focused (Magical), Retention and Wild Ability. She also has Magery 0 and some minor new age mumbo-jumbo as a Dabbler, but no real knowledge of supernatural things. She does have Dabbler for Philosophy (New Age)* and skill scores of 11-12 in Philosophy (Aikido - Optional Specialiation Morihei Ueshiba) as well as Theology (Shinto - Optional Specialisation Omoto-kyo).**

Her player wanted to use her unknown affinity with the supernatural to keep a girl, Rebecca Danzig, from dying. Ms. Danzig was in a coma when the PCs found her, suffering from severe if not terminal hypothermia and there was reason to believe that her extremities were frostbitten and might start to mortify. She's also dehydrated and malnourished, perhaps even to the point of death.

Fantasy style healing magic will not be featured in the campaign, at least not magic that visibly regenerates injuries in seconds. Subtle succour is in genre, especially if the injuries being fixed are not visibly large-scale destruction, but more a matter of a minor adjustment to internal regulation of temperature.

Magic in the setting will probably use Path/Book or Ritual Path Magic without Ritual Adepts.*** Earth is No Mane to Very Low Mana, with occasional exceptions related to special places, special times and special beings.

Now, the PCs are in such a special place at a special time, but the magical influences around them are heavily aspected toward winter, cold, hunger, darkness and something else, something that Special Agent Frank Corelli (PC) would probably call evil, outdated and reactionary as that term is in the eyes of 'modern' Californian people from the 1980s.

Ritual elements: On the other hand, the PCs are carrying protective charms specifically designed to protect from the evil spirits that cause the cold and hunger, given to them by a wise Native American in some sort of spirit trance. Agent Estevez also has some of the mushroom paste that Joseph Greybear used to enter the trance.

All the PCs also wear crosses with personal significance to them, having all been raised Catholic, with at least one religious person close to them during childhood. Special Agent Rene Ledoux (PC) also takes care to throw down all the carefully posed ritual objects with creepy significance that were surrounding the girl when they found her.

Using these things as ritual focuses, as well as using the fierce protective need of Agent Corelli toward an innocent girl in danger, Agent Ledoux's hatred of the cold and love of warmth and Agent Estevez's own overflowing affection for her fellow creatures, Agent Estevez attempts to draw on the warmth and strength of the three FBI agents to help Rebecca Danzig to live and be healthy. She calls out to the spirit of Joseph Greybear to aid her, guide her and teach her how to let the golden light of their love bring Rebecca back to life, let her coma turn to healing sleep.

The player rolled well, for an effective success by 5 even with penalties, against any Path I might have ruled this required. So I didn't bother with precise calculation. But, since the PC has Retention and had some 20 unspent points lying around, I'll have to decide before the next session what ritual she was using and what Abilties and Spells she ought to be able to spend points on.

Questions that need answering:

1) What Paths were involved in the ritual and can Agent Estevez spend points on them all?

2) Did the ritual require any Advantages that Estevez didn't have, but used Wild Abilities to use for the attempt?
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3) In the Path/Book system, Agent Estevez basically cast Succour. Maybe I'll just go with that, but it has the flaw that there is no system to create new rituals. Does anyone have suggestions on how to use the Path/Book system, but still be able to adjudicate new rituals?

4) How would one write up the ritual Agent Estevez performed in Ritual Path Magic?

*She's raised in 80s California and has Eidetic Memory.
**She's a 4th Dan in Aikido.
***More precisely, they'll exist under limited conditions and/or even outside normal reality. Meeting one will be the culmination of an adventure and probably a very hostile meeting.