I'm not sure I see the value to her or the loss for Dems. The dems still hold the majority, Sinema mostly votes with the Dems and she says that changing parties isn't going to change her voting habits anyway. Harris still hold the tie braker.
This neither helps or hurts the Dems or Rep.
True and she waited until the Georgia runoff. She was hoping it would have more of an impact to be the swing vote. The power of the swing vote is what this was all about.