Most likely it has unbalanced or bad tire(s). Bent wheel rims also can be the cause.
Nope.
When driving the IAC does not do anything because the car is not at an idle
Peeing off the side
Yes, it sure can. Have your tires inspected and balanced before assuming the drive shaft is the culprit. You may also have a bent wheel.
Remove the muffler
It might have run out of gas.
Front Wheel alignment
if its while your driving it could be wheel bearings
Your u-joints are worn out.
The symptom would indicate a wheel/tire/balance problem. You need to have a professional inspect if you are driving at those speeds. also make sure if you drive at 120+ mph, you have "Z" rated tires for safety.
if she could not do shake it up
Typically, drugs don't make you shake. You would shake when you stop taking them if you are addicted. Typically, that is downers like alcohol and maybe heroin and other opioid narcotics.