She meant Krait venom not Crate venom.
The common krait's venom consists mostly of powerful neurotoxins, which induce muscle paralysis. Clinically, its venom contains presynaptic and postsynaptic neurotoxins,[1] which generally affect the synaptic cleft (the points of information transfer between neurons).
In mice, the LD50 values of its venom are 0.325 mg/kg subcutaneously, 0.169 mg/kg intravenously, and 0.089 mg/kg intraperitoneally.[4][5] and the average venom yield is 10 mg (dry weight).[6] The estimated lethal dose for humans is 2-3 mg.[7]
(Wiki) I know wiki sucks but we're tallking about a snake (reptile).
Kraits are nocturnal, so seldom encounter humans during daylight; incidents occur mainly at night. Frequently, little or no pain occurs from its bite, which can provide false reassurance to the victim. Typically, victims complain of severe abdominal cramps, accompanied by progressive paralysis. If death occurs, it takes place about 4-8 hours after the krait bite. Cause of death is general respiratory failure, i.e. suffocation.[8]