Re: Zoe Heriot's Advantages
 

Since I have access to multiple DVDs of Classic Who, I am somewhat familiar with the character of Zoe. As shown in the classic Second Doctor story
The Invasion, Zoe clearly has both Mathematical Ability and Lightning Calculator. Her difficulties with social interaction suggest she is a high-functioning autistic.

Re: Zoe Heriot's Advantages
 

She's supposed to have had a very sheltered upbringing. Zoe didn't recognize what a candle was or references to common fairy tales. Zoe has had a "Mentat" like training for her education. The only time we get something from Zoe that suggests a normal upbringing is the bit in The Mind Robbers were it's revealed that Zoe read comics and knows some superheroes.

Compared to other companions Zoe might seem a little autistic.