Reddit mentions of Wildlife 523 Coyote Urine, 4-Ounce

http://www.amazon.com/Giant-8-Foot-Black-Dildo-For-Parties/dp/B0000AVXJ8/ref=sr_1_4?ie=UTF8&qid=1405647974

I suggest you to fuck up with her life in a not-too-harmful way.
I'd give you some examples if I'd known more about you guys, so you'll have to be creative and come up with your own mind games.

Some very general and innocent examples like putting salt n' pepper in her coffee, filling the shampoo bottles at her house with yogurt, or even just hiding her cellphone away from her and make her panic.

Ofc you could join the dark side and use stuff like spilling coyote urine on her bed(the smell is SUPER GROSS and lasts for days), sending her a pack of living insects as a gift, or just renting a couple of goats and letting them loose in her house.

Since you can't get rid of the problem(your MIL), you might as well just enjoy trolling her.

Dead bat

Chocolate bugs

Nipple suction device

Butt hook

Speculum

ANAL speculum

"Magic hand"

Giant inflatable dildo

Enema kit

"Knuckle up" dildo

Finger tentacles

Yodeling pickle

Inflatable toast

Bacon lip balm

Coyote urine

1,500 live ladybugs

Canned unicorn meat

Weener Kleener soap

"Liquid ass"

Macaroni and cheese air freshener

Fetus doll

Oh man, this was fun. I had to eventually just make myself stop looking because I literally could have linked about 100 things.

Amazon has it.

​

https://www.amazon.com/Wildlife-523-Coyote-Urine-4-Ounce/dp/B0000AVXJ8

Try some of this: http://www.amazon.com/Wildlife-Research-523-Coyote-Urine/dp/B0000AVXJ8/ref=sr_1_3?ie=UTF8&qid=1405028715&sr=8-3&keywords=wolf+urine