She needs to come up with ideas that ensure that Krishna does not get negative ideas in his mind. I don't expect her to do cheap things as Amma but still she needs to respond to that instead of nature to fix itself.
A lot of people would prolly say if thr love is true nothing should happen. But the human mind is made to doubt ppl. Even the most solid relationships get moved by the idea of doubt on the partner or if some fills it with venom. It may be temporary but it happens. So, Pratigya better do soemthing abt all this before it is too late.