I saw my sister naked and now it's awkward. help!!?

Long story short she was takin a shower and I had to pee. was waiting outside the bathroom door for her to come out and she comes out without clothes on. I'm NOT attracted to her. never was never will be. but I don't know what she thinks now. she feels pretty freaked out, and ignores me as much as possible. she was pretty close to me but after this the whole world seems weird to me. I can't look her in the eye and neither can she. so what to do now. how to go back to the old life, or at least how do I tell her we should put this past us without making it anymore awkward.
I saw my sister naked and now it's awkward. help!!?
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