Your facts are irrelevant to the legal recovery you seek, and the amounts at issue for parking fees make even small claims court "expensive".
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
Ditto on using actual names. If she is now an "ex" spouse, the time for collecting those costs from her or her employer has past as your divorce decree likely declares your financial ties to be severed. Move forward, don't look back, and live well.
I agree with the other two lawyers. In addition, I do not see any rationale for recovering anything from her employer. Moreover, I wonder about your motives for posting this inquiry, and I caution you that you might be exposing yourself to liability by using actual names of identifiable individuals. This forum is public.
These comments do not constitute legal advice. They are general comments on the circumstances presented, and may not be applicable to your situation. For legal advice on which you may rely consult your own lawyer.
Sign up to receive a 10-part series of useful information and legal advice about the divorce process.