Wasn't that Janet Jackson?
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Heheh, sorry I couldn't resist.
Actually, I did a Google on the parameters you mentioned [NFL, halftime, jazz, singer, female] and came up with Jeri Brown.
From your physical description I don't think it's her, but after visiting her website I'm interested in hearing this lady sing.
From a physical standpoint, Jay may be much closer, but didn't you say this singer WASN'T well known? The only other singer I can think of who performs barefoot is Sade.