I agree with this. I really detest this culture of trying to screw employers over on things like this.
What about the culture of poor employers trying to screw employees over on things like this?
I agree that suing in a situation where there's been no tangible loss is wrong, but in this case, (if the OP's story is accurate), then his partner suffered injury and loss of earnings due to the employer's failure to correctly install a disability aid. Why should she be out of pocket because they decided to cut corners? They should have allowed her a couple of days off to recover on full pay, which would have been the end of it.
To be honest, it sounds like she'd be better off out of there, as it sounds like a terrible company to work for!