When I used to work with disabled people I had an incident with a client involving ranch dressing. This person was very difficult to work with, and had once attacked me with a baseball bat. They all had meal plans we helped them stick to, that they helped make up and cook and stuff. Healthy stuff, and most of them had diet restrictions we had to work with.
So I'm like, "Hey, it's about lunchtime. Should we make some lunch?"
And they said: "No, I'll just make something quick."
At which point they pulled out a bowl, and got ranch dressing and cheese cubes out of their fridge. Tried to talk them out of it but they started to get very very agitated and I knew to back off because of the flight risk and so many other things. So yeah. Ranch dressing and cheese cubes in a bowl, with a spoon, like milk and cereal. Not a small bowl, like a full bowl of ranch dressing and cheese. I filled out some paperwork concerning the incident and was thoroughly grossed out but thought that was the end of it. Wrong.
A couple hours later there was visible fecal matter all over the walls, in their bed and everywhere in the bathroom you can imagine. We were supposed to go to the park and run some errands that day, but instead I spent it cleaning, disinfecting, and bleaching things that probably should not have been bleached. All the while the client was angry and screaming at me, probably embarrassed about what happened and yeah wanting to go out and do things. Getting them clean was the hardest part; had to chase them around and they locked themselves in the bathroom and bedroom before getting completely clean. Which was why the mess had made it everywhere.
OP, your mom has good reason for not allowing you to drink ranch dressing. It's disgusting on so many levels, and it's bad for you. Plus she probably has some nice furniture she doesn't want to bleach.