She doesn't have to flip and prosecutors don't have to honor the agreement but you can bet that she is scared shitless of the MAGA nuts so that may be an act out of desperation.
Only observation here, not a vet here but, other animals do not get the same symptoms as humans in fact deer are virtually immune to Lyme disease. Lyme disease in dogs tends to make them tired and listless. I'm sure they have sore joints too. Antibiotics clear up the disease better for dogs, if they can tolerate them, than humans.
At some point people on the left have to bite the bullet and run candidates from the ground up in order to get someone who has ANY chance to actually change anything. In the meantime the sane people must hold the ground against fascist authoritarians by not allowing them to get into power at all costs - this means voting for the lesser evils until someone with a chance of a snowball in hell moves into position. That is how the crazies got their man into power. Schoolboards, county officials, mayors, even dog catchers must be pushed up the ladder of power. Anything less is just blowing smoke.