Of course she is not just standing there, but when you pull out the Pillars of Light you are not casting a Temple. You can either stock up 6 in your book or add a wand in and bind it to a wand. Once again not casting Temples. Which was my point, I can easily get two Temples out which are ok and then I have to move to either defending myself from attacks or spending mana to "prevent" these attacks or equipping up.
Yes when the stun hits it messes up the other mages timing. But have not found that by round three it (Temple Strategy) gives me such of an action advantage that I can win. I have found just the opposite, I have spent mana on a half developed strategy that could be much more usefully spent on other spells such as equipment or non-school spells that deal damage like Hurl Bolder. My opponents spell book is designed specifically to kill the Priestess he has literally dropped everything to get into face.
Rd 1 QC - Deathlock / Move twice
Rd 2 QC - LOH Move Attack or Move Move
Rd 3 FC - Adramelech, Lord of Fire QC Hurl Boulder
Rd 4 LOH / QC Reverse Attack (PoL stun yourself)
rinse and repeat
Well, I think we found the problem here. Your opponent is cheating. Let me break it down here and show why:
Rd 1 (19 mana to start): QC - Deathlock (9 mana) / Move twice (10 mana at end of turn)
Rd 2 (19 mana to start): QC - LOH (8 mana) Move Attack or Move Move (11 mana at end of turn)
Rd 3 (20 mana to start): and here is where your opponent cheats because with 20 mana there is no way he's casting Adramelach, let alone casting Adramelach AND Hurl Boulder.
So the first step for you would be to make your opponent only spend mana he actually has, and not just spending whatever he feels like. Bottom line is that a Warlock player is not going to have Deathlock + LoH + LoF by turn three. He only will have access to 37 mana by turn three and those three cards cost 41. Something has to be dropped. Now if he goes with Vampiress instead of LoF, then he could do all that, but, as good as the Vampiress is, she's not nearly as scary as the LoF.
Some of your other points don't make much sense to be honest. You say if I'm casting Pillar of Light I'm not casting Temples, but I have to ask... why? I can cast two things a turn you know?
Also, as another poster pointed out, if you have a facedown Enchantment out (like the Reverse Attack you mentioned), I'm going to hit you with the Temple of Light, which fires for free and you're going to spend 7 mana to redirect the attack back to it, which will do minimum damage, if any, and Conjurations cannot be Daze/Stunned. That is a win for the Priestess because you are down 7 mana, which isn't being used to attack me...and I'm still hitting you with the Pillar of Light for a 4+ Daze...