Hi there, this is Dr. Elaine.
When did she eat this?
How is she acting generally?
This is not a toxic dose.
Believe it or not, studies have been conducted in dogs, dosing them at 30 times the dose she ingested before negative clinical signs were observed.
Still, as with any drug, allergic reactions can look like an overdose of said drug, so signs of serotonin syndrome would be watched-for. Rapid heart rate, uncontrollable tremor or shaking, seizures.
Peak plasma levels occur within 4 hours, and taper after that, so any clinical symptoms not seen by then are unlikely to develop at all.