We really have no idea what you are asking.

No you cannot break in and get your belongings.

The only question is in whose name the car is titled. If it is in your name, you can sue her for return of it, or even involve the police. If in...

You can certainly contact the police. It is up to them whether to pursue.

It depends on numerous factors, but eventually a judge may have to decide.

Your employer is not liable for the theft.

You can sue them in small claims court, although it might cost more than you can recover, and winning is by no means certain.

It appears you have answered your own question. Time to lawyer up.

If you PO says you can't smoke weed, you can't smoke weed.

It will not likely be worth the cost of pursuing unless you suffered a severe or permanent injury.