Sorry to hear of the accident! Hope you and your wife are okay. She should definitely, absolutely, and without any hesitation see a Dr tomorrow. She should have done so today. Better to be safe than sorry! You should to, if you have even the slightest discomfort.
Too bad about the car 300e. Part of the purpose for a MB is to give itís all to save itís passenger. It sounds to have done well in that regard.