Ecstasy drug also known as MDMA or 3,4-Methyl enedioxy methamphetamine is a psychoactive drug.
The drug is taken to alleviate the level of energy and pleasure which are caused by increasing the activity of other neurotransmitters like dopamine and serotonin.
In the given question, since the Sarah is full of energy and behaves in an optimistically manner therefore she has most probably taken the ecstasy drug.
I believe self esteem is about how confident one is with themselves and whether they are happy around people; if they have a low self esteem it means the person does not believe in themselves and sees themselves as not upto some sort of standard.
