It sounds like the bass was recorded direct, slightly overloading the mixer preamp. She probably also used flats.
Depending on the bass you use, you might need to favor the neck pickup. Hope that helps!
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I think back then (late 70's) she used a short-scale (30") Fender bass with flatwounds, probably played with a pick. The flats are the key element to that sound if you ask me.
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