Did Sarah Smart do her own singing?

There are a few instances throughout the show when Virginia (in dream sequences) sings. Does Sarah Smart do her own singing? I'm not familiar enough with the original songs to know if they just used them with her lip-syncing, but the voice in all of them sounds pretty much the same? Not the same as her speaking voice, but singing and speaking voices are often different.

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How do you know if you're happy or sad without a mask, or angry...or ready for dessert