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Rio_ said:
I'd love to be able to desensitise myself to her singing, but how would I go about doing that?

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Like you would anything else. Deliberately "tune in" to her singing a little before allowing negative thoughts and then a little more the next time, etc. Think about the song, your sister, why your sister might be singing along with THAT song. Notice if she sings the same songs or different ones or all the songs, indescriminately. Is she an alto singer, soprano, tenor? Does she sing along with appropriate radio songs, those that she can sing "well"/easily? Get your creativity into thinking about "singing" in general and then you might not mind your sister's singing in particular :-)