If you mean a single overdose, I would be most concerned about her liver; over time, many of the organs--stomach, kidneys, etc.--could be adversely affected.
I'm not certain how long it takes to leave the body altogether, but the immediate effects can take up to 24 hours to fade.
Re: [same writing as OP]
I'm not certain how long it takes to leave the body altogether, but the immediate effects can take up to 24 hours to fade.