While I think she's looking for deep pockets, I have also read about similar things and I think she probably has a case. This drug actually does seem to stimulate compulsive behavior in some people, and it's not necessarily anything that they have had a problem with in the past and one could attribute to extreme but basically normal behavior. The brain is a truly strange thing, and drugs that tinker with it - for beneficial purposes on one level - should be watched very carefully for other effects.
If the drug is beneficial to 99% of those who take it, and harmful to 1%, I don't think the 1% should sue for bad side effects.
It's like suing peanut farmers if you find you or your child are allergic to peanuts.
And even a 1% bad side effect would probably eliminate the drug from ever being marketed.