It seems theres too many shows on tv diagnose collectors with phsycological problems. How is it any different than ranchers that raise cattle or horses and sell for money. I could understand if you had 27 cats in cages up to the cieling but i think the problem lies in your moms misunderstanding of what "owning snakes" really is.
When i tell people that i own 10 snakes they envision a house full of dirty tanks and cages . In reality its a corner of my bedroom with a asthetically acceptable rack. It doesnt take much money owning them. Maybe a visit or even a webcam walkthrough if your house will clear things up a bit