What does it mean income?

Income is money what an individual or business receives in exchange for providing labour, producing a good or service, or through investing capital. Individuals most often earn income through wages or salary. Businesses earn income from selling goods or services above their cost of production.

Explanation:

the narrator is saying that the old lady made her feel uncomfortable. you know this because they say "i found that rather irksome", "perhaps it was her being so upright and trim", and "i don't think it was that, because i thought that quaintly pleasant." hope this !