I always trim Tucker's feet about once every week to week and a half. I shave the bottoms of his feet with clippers and then brush back the fur between his toes with a slicker brush and trim it down with scissors. I can't stand the grinch feet look. Not trimming it will not hurt her, but a lot of people prefer the neater appearance of nicely trimmed feet.
If you dont trim them they can get tangled. When I got Pawley from the shelter, he had little grinch feet, I trimmed it and then noticed his feet looked puffy. Picked his paw up and he had little knots of hair on the top of each foot. So I had to trim them. He has the thickest fur, I have ever had on a golden. I do think grinch feet are cute sometimes.