I'm happy to hear more about this, is this something you've personally done or represented someone in such a case? What steps should one take in such a situation, if you have experience in it?
Im not sure why in this situation you would not consult with an attorney to explore your legal options? Consulting with an attorney and at least initially engaging in a legal discourse with your previous employer is really not that expensive and many times if you have a viable case the legal costs are paid only by a successful settlement. Im not sure what she has to lose here besides seeing if she can get a lawyer to take it on contingency and time documenting the damages.
My honest guess is that IF she has documentation, having an attorney engage Uber would just result in some form of settlement to not have it go into court.
I don't mean this is merely or even at all a matter of practical difficulty. Few people go home and toss in bed thinking about how they can sue their employer. I find 'she should have just sued' is pretty glib and why I ask "have you done that"? I don't think it's an easy thing and simply throwing it at someone who's taken the time to publicly describe their experience is rather missing the point.