From what you've said I can see a possible case for negligence here, but it would not be an easy one to make. If the company owns or controls the parking lot then it has a duty to take reasonable steps to protect the employees and cars that are parked there. What is reasonable depends on a lot of factors, like the history of any trouble there, what kinds of problems are reasonably foreseeable to occur, what it would cost the company to implement various protection measures, etc. Unless there had been some history of problems with vandalism, theft, assaults, etc., in the parking lot the company may not have had reason to believe much in the way of security was really needed in the lot. So whether there really needed to be security cameras or whatever there is an open question. And in this instance you aren't alleging some random act of vandalism but rather that another employee did it out of spite. So you may need to prove that the employer knew that the employee might do something like this and should have at least followed its own procedures to accompany her off the property.
But think about this: if you sue your employer over this, it will not make your employer happy. You may find that you and your husband are on the short trip to job termination if you decide to do that. And that would be perfectly legal for the employer to do. Is getting reimbursed your deductible worth both you losing your jobs?