I think she is quitting just because she doesn't want to hand the gavel over to a Republican at the formal ceremony. That is so childish, but typical of democrats.
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As the outgoing Speaker, she will hand over the gavel to the incoming Speaker.
She had announced that she will not be her party's minority leader. That is a completely different role. "Speaker of the house" is a constitutional office, like the Presidency. Party leadership roles are not constitutional offices.