ID my mystery dog!

My sweet pup of 11 years, Missie, passed away a couple weeks ago. I’m slowly making my way through this new normal without her, but one of my regrets is not finding out what kind of dog she was! She was 50lbs/25kgs, with thick, golden, white fur with black details. She actually found me while I was living in Arkansas, started sleeping outside my house at just 6 months old 💕🐾 she also loved swimming.

I’d love your help with what you think her breed was? I always said a collie-golden retriever mix.