She mostly used Jazz basses with a pick, sometimes she used a black Precision with rat stickers on it. She recorded most of the pumpkins songs while she was in the band except for Siamese Dream. I don't know much about what amps she used but it was a Trace elliot rig for the early days and an SVT rig before she quit, in between that time she often used a rack setup with nameless looking cabs and it's hard to figure out what this gear was. There are also some youtube videos of her recording songs from Mellon Collie. I totally love her tone on Mellon Collie, (one of the reasons I play a jazz with a pick) well actually I love all the tones on that album, Billy has an amazing guitar tone as well. I saw them live on the Siamese Dream tour and on the Mellon Collie tour, they were very good.