while I don’t think an aged up Claudia would give a second thought to ravishing Louis,

YEP NO HESITATION THERE bc let’s be honest we all want to ravish Louis ok.

she’s a symbol for everything that horrifies him about himself, and I don’t think that that would exactly be grounds for amorous thoughts. 

Indeed.

Sure, he loves her and cares for her,

Exhibit A:

but I think if she was an adult, it’d be a lot easier for him to see just how far mentally out there she is, how evil, how unable to understand human goodness she had grown to be.

She’s worse than Lestat about playing w/ her food, that’s for sure, and choosing to kill innocents specifically is NOT a turn-on for Louis.