Make her pay the $70 plus $200 for emotional distress. It’s a spider, for crying out loud! Who has a pet spider, anyway? You can buy exotic animals, but you can’t make a “pet” out of them; they have no emotions, only instinct. A curiosity specimen; a possession, like a piece of jewelry or a hobby, is all “pet” snakes, lizards, spiders and fish, are. Some bvirds will interact with a person, and mammals will, but insects, reptiles, amphibians and fish? No.
I have pet spiders... but I wouldn’t pay 70 bucks for one. I have a wolf spider that guards my banana bowl. Needless to say, I have no gnats.
Pursuit of happiness + private property + legal = none of your biz.