While this is truly inconvenient and horrible in the worst way, I'm confident the investigation will pan out in your favor.
They may be contacting other passengers that took rides with you around that same time, trying to see if the allegation is true.
Obviously, having a non-passenger in your vehicle is totally unacceptable, and completely against the rules, hence the deactivation. I realize that you did not have someone in the vehicle, so the claim in unfounded.
For a comparison, think about if a guy goes on a date with a girl. The night is wonderful, and they end up at her place. Sparks fly, magic happens, and he goes home. The girl then goes to the police and claims he raped her. The police will go and arrest the guy. Period. An investigation will take place, and hopefully he's found not guilty, and released. He's been arrested, though, and put through that hell and torture.
Fortunately, Lyft isn't putting you through all that. They've deactivated you, mweiss10, and you'll lose out on some money, certainly. It's important to them to keep their platform operating smoothly. Put yourself in their position, and think what you would do, or what you think they should do.
I sincerely hope it all works out for you.
Walt D inLV