Summoning is a solid idea! It doesn't even need feat investment to be effective. Just summon a few creatures, then cast bless.
Possible Changes:
If there aren't a lot of undead in the campaign then the dm might be ok with her taking the Light subdomain of the Sun domain. This'd give her a 20ft radius AoE blind ability 7 times per day. Assuming she can call a quick warning to her allies for them to cover their eyes while she explodes in light, it'd be a great battlefield control ability.
(On a semi-related note, I tend to prefer the Restoration subdomain of the Healing domain too, tending to get more use out of Restorative Touch than Rebuke Death)
Feats:
Selective Channel is always useful, as is Quick Channel to be able to channel and cast a spell in a single round.
If any others in your party use shields Channeled Shield Wall is a nice support feat.
If set on melee attacking, Channel Smite and Guided Hand will let her use her wisdom to hit with her scimitar.
A nice option to go with this is to aim for the Divine Scion prestige class. It doesn't hurt your spellcasting levels (though it sadly doesn't improve your channel energy ability like normal cleric levels would). And she'd need to take Iron Will and Weapon Focus (Scimitar) as her other two feats before level 6.
Still, going 4 levels into it might be worth it for your spells dealing extra damage to some creatures (probably evil ones) and getting to choose a spell-like ability to have 1 or 3 times per day. Keep in mind that she wouldn't have to choose the Sun or Healing domain specialization powers. My personal favourite would probably be going for Luck to get divine favour 3/day and +2 on reflex saves. If your game goes to level 11 she could then take Quicken Spell-Like Ability as her feat to be able to cast those divine favours as a swift action.
It'd also let her take Weapon Specialization in scimitar for another +2 damage. Again though, might not be ideal considering her physical stats, and it hurts her channels. (I tend to allow taking a feat similar to boon companion to give +2d6 to channels for multiclassing purposes, it's firmly in the homebrew rules though)
Combining this option with guided hand could work quite well, but would easily eat up all of her feats.
If going that route, then obviously don't buy strength boosting belts, focus more on con or dex for defense and prioritise wisdom for all of the associated benefits.
Spells I really like for affecting combat in meaningful ways: ENCHANTMENT SPELLS!!!
Suits her high wisdom score (high DCs), and her high Charisma (role-playing wise)
Murderous Command at level 1, make the enemy do your damage for you.
Hold Person at level 2, one of the more satisfying ways of affecting battles with humanoids.
As a general rule, target the enemy in the heaviest armour! They are usually the most weak-willed. =D
Doesn't work on undead, but she has her channels for those!
Also, spiritual weapons! I'm not sure about this, but if there isn't a limit to the number of weapons you can have out at once, she can fill the air with damaging spectral weapon swings! They also work off your wisdom score, so no need for high physical stats.
Another trick I particularly enjoy is creating or somehow acquiring a custom magic item to cast spectral hand a couple of times per day. Lets you deliver touch range spells at up to 130ft range for 3 minutes per use, handy for dishing out the buffs/cures/inflicts in combat.
With that dex score I'd be wary of using ranged touch attack spells like searing light, it's just too heart-wrenching when they miss, but there is one other decent damaging spell that involves taking a feat to get, and your dm might not be happy with, but should be fine to do. Taking the feat Experimental Spellcaster lets you choose the effect word Discordant Note as a 2nd level cleric wordspell. Up to 5d4 (1d4 per level) sonic damage, cast as either a 20ft line, 10ft cone or 10ft burst. With staggering on a failed save. The Intensify Spell metamagic feat would let you have a 3rd level spell with up to 10d4 sonic damage. The main reason I'm mentioning it is that if you go for the Divine Scion approach you end up adding +10 to the damage versus evil (or other) creatures. Which is fairly nice for cleric spells. It's almost like a sonic fireball... I keep telling myself...
Good god I talk too much!
