I'm so sorry that Lola passed.
In my experience, rabbits will go down hill very fast and often times there is nothing you can do.
Recently, Zeke passed away from liver failure (cancer), and he was acting fine up to about 8 hours before he died. He was a bit disinterested in his morning pellets, and a bit more tired/sleepy. By dinner time, he was having problems standing and was having serious troubles. By the time he was having serious troubles, and signs that it was more than just a gas attack, it was too late for me to get him to a vet, he passed as I was calling the nearest emergency vet.
If you do want to have a necropsy done, make sure you keep her body cool in a refrigerator. I normally have one done so I know what happened. I would have felt guilty forever second guessing that there was something I could have done, and it was somewhat relieving to know it was cancer with Zeke.
-Dawn