Here's a sample build that she could have after a few months in Sorcerer's Deep (time spent healing and in the Scholarum where she might teach and she might learn some things from our Divine Casters and maybe even Lya (who's doing great at blending Divine and Arcane Magic). I'm giving her the Elite Array because she's level 7, which probably indicates an exceptional life).
Retraining needed: She'd have to retrain a few skill points and feats. Still, although doing this probably makes her pretty busy (and therefore unusable) for the next few months it's probably way faster than retraining 7 levels into Cleric levels.
Sarah the Healer: Human Sorcerer 7
HP: 26, Initiative: +0,
AC: 10, Touch: 10, buffed 22 (+8 natural armor from Alter Self, +4 Mage Armor)
Fort: +3, Ref: +3, Will: +7,
STR 8, DEX 10, CON 13, INT 12, WIS 14, CHA 16,
Feats: Able Learner, Still Spell, Flaw (noncombatant), Flaw (shaky), Versatile Spellcaster, Sculpt Spell, Touch of Healing, Arcane Disciple (Renewal),
ACF: Metamagic specialist (4 times per day, use Metamagic without increasing casting time), no familiar.
Skills: Concentration +11, Heal +7, Profession (Healer) +7, Knowledge (arcana) +11, Knowledge (Religion) +5, Spellcraft +9,
Equipment: Everyday clothing, dagger,
Attack: N/A, BAB is +3, Flaws= -2 to melee and ranged attacks,
Spells Known (Spontaneous Caster):
Level 0: Arcane Mark, Detect Poison, Detect Magic, Message, Mending, Read Magic, Prestidigitation (6/day)
Level 1: Grease, Mage Armor, Magic Missile, Sleep, Charm Person, (7/day)
Level 2: Alter Self, Glitterdust, Lesser Restoration (Renewal Domain spell), (7/Day)
Level 3: Deep Slumber, Remove Disease (Renewal Domain spell) (5/day),
Note: Each day she can cast a maximum of once Renewal Domain spell of each level. They are Wis-based. As long as one is uncast, Touch of Healing can be used as an at will standard action and up to 1/2 of target's max HP. Each use heals 3 points of damage per level of the highest-level conjuration (healing) spell available.
Focus: She's a passable healer with a focus on AoE control/save-or-suck spells - she has a good selection of those and can use Sculpt Spell as a full-round action if needed. Mage Armor and Alter Self (and the Knowledge skills to know that Humanoids with +8 Natural Armor exist) give her a good AC for a long duration.
She's a decent AoE control sorcerer who can also heal all day and has access to some great healing spells in an emergency (Lesser Restoration, Remove Disease, even Reincarnate soon). And having a minor caster with access to Reincarnate means being able to sell de-ageing services to those rich enough to pay for components but too poor to pay for us to Bloodwish them into a human. But a young gnome is better than an old human, after all... And if they're lucky they'll land "elf" and get 300 extra years to live!