Welcome! Yes, what you see here on my blog are only opinions, which are based on my own reading of the books, my experience of movie!IWTV, and conversations I’ve had with other fans for all these years. I’m glad people have their own ideas, their own interpretations, I’ve learned a lot!
So what if one of the reasons why Louis loved Claudia so much was because Claudia somewhat resembled Louis’ wife?

It’s quite possible! Since Louis doesn’t have a wife in the books, only in the movie, we can only speculate about her. But I like to think Louis’ wife resembled the statue over her grave. I would think that Louis would have commissioned it, or been the one to choose it, but then again, it might have been in his family cemetery already.
If we look at the script, (you can do the google and you’ll find it), we get Louis’ wife’s name, Dianne de Pointe du Lac:

^BTW, I think the wife’s name is “Dianne” bc HELLO “Anne” Rice. “Die, Anne”? Maybe?
In the movie we know Louis’ wife died in childbirth and that’s all we really know about her and we never saw what she looked like. Maybe she had blue eyes and soft curly blonde hair like Claudia?
That’s definitely possible! There is a fic out there that suggests that Lestat would introduce himself as Claudia’s mother’s brother, hence their strong resemblance, and that Louis was in fact Claudia’s biological father. And that Claudia’s mother had died, and that her loving uncle was helping to raise her ❤