She might have just been stupid instead of intentionally killing him.
That's what it sounds like. If she really only gave him a small portion of an adult dose, I'd say there was no intent.
Anti-histamines are considered one of the safest drugs. It is likely she didn't think it would harm him.
I had a 115 lb yellow lab that ate about 6 to 10 12-hour dimetapps. After the people at the animal poison center quit laughing, they told me either the dog would sleep it off or would be hyper, but not to worry.
Yes. Murray documented in The Bell Curve that the average unwed mother has an IQ in the 80's. Verging on borderline intelligence. I suspect Tisheena fits the demo pretty well.
That's what it sounds like...