I would personally suggest asking if she's willing to do a little trimming so you had an easier time finding your way downstairs. I don't think it should be too offensive if you highlight that it makes it a little more difficult for you. Enticing her to pay a little more attention to the grooming of her privates may eventually warm her to the concept of removing more, with or without your approval. This is how it came about for me, anyhow.
Even though I'm completely bare, I've always been a little funny about looking like a 12 year old downstairs. I do believe that women should at least pay attention to their pubic hair care and keep it neat and tidy where they can. I expect the same from any male partner of mine.
Hope that helps!
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