I do not see how she could be removed against her will. She would have to withdraw her name.
The hundred or so million dollars raised by the campaign would have to be refunded or go to the DNC, other political causes, or the Biden campaign.
The Clintons could not walk away with that money for their own personal use.
PIAPS could legally do three things with that money
1. Donate to Charities or political parties (The Clinton Foundation anyone?)
2 Donate $2000 to another candidate
3. Save the money for another campaign.