I looked up the text of the 25th Amendment just to be sure, and the answer is it doesn't.
The amendment has four sections, which briefly summarized are:
- If the President is removed in any way (through death, resignation, or impeachment), the VP becomes President.
- If the VP is removed in any way, the President nominates a new VP, who becomes VP upon a majority vote from both chambers of Congress.
- If the President informs Congress through written declaration that he is unable to perform his duties, the VP becomes Acting President until such time as the President sends another declaration that he's capable of resuming.
- If the VP and a majority of either the Cabinet or Congress believe that the President is unable to perform his duties, they can enact a process to remove him from office temporarily, with the VP becoming Acting President. It's basically the same as Section 3, but with the ability of the VP and Cabinet/Congress to override the President's declaration, with the matter then being sent to Congress who can vote to continue to keep the President out with a two-thirds majority.
There's no way to use the 25th to get rid of a VP, nor can the VP be fired through other means. The only way to get Kamala out of the White House would be to have Congress impeach her or to put some sort of backroom pressure on her to resign. The former would never happen, and the latter is unlikely. Kamala assuredly doesn't like the position she's in now that she realizes she isn't the power behind the throne like she thought she'd be, but she also knows there's really nothing equal or better for her right now. What's she gonna do, go back to being a Senator? Depending on if/when Feinstein kicks the bucket, she could miss that opportunity.
So yeah, sorry Jill, you're stuck with the cackling harpy, just like America is.