No, worst case is that her team loses every game in the PAC-12 and has a worse non-conference record than they have achieved in recent years, also. For example, they could go 3-17 overall.
I agree- the worst case scenario is that she will do as bad as the team she took over in which case she will lose her job. That is actually a realistic scenario. Of course it is easy to say yes recruit more Americans when it is not your job on the line. Most coaches if given the choice between losing their jobs and giving marginally competitive American players more scholarships, would choose to keep their jobs. The only way I can see that ever changing is if the AD decides that giving Americans more scholarships is more important than winning at their particular (nonpowerhouse tennis) college or the NCAA decides to limit the number of foreign scholies.