Answer:
it is 80- 90 % chances of relapse, almost certain for the relapse to reoccur.
Explanation:
Generally bipolar disorders can be caused by genetic and environmental factors.  One of the examples of environmental stress that causes bipolar disorder is mental stress and  family abuse in  which Shonda is entangled. Evidences has shown that some recent events of life,and interpersonal relationships are examples of  predisposing environmental  factors that triggers onset of bipolar disorders and relapse.
Therefore her  enmeshed or entanglement  in the family situation put mental stress on her; which cause her ventral system( parts of the brain which control emotions) to be over activated and the dorsal systems (parts which control  memory to be underactivated  which results in relapse.