Help with my younger sister!

I have a sister who happens to be younger than me... well she was on the internet and happen to be on an advice site sort of like this one. Well she came across a question that freaked her out. It was a question from some girl asking if she could get...

pregnant if she humped her hand. Someone answered it by saying yes. My sister is scared now because she admitted to me that she does that sometimes. Now she's scared she is or will become pregnant if she keeps this up. I tried to tell her that the person who said yes was just being sarcastic and that you can't really get pregnant from humping your hand because the only way you can get pregnant is if you have sex with a guy but she didn't really get it. So does anyone have any tips/advice on how I can get her to believe that that question was rather dumb and that the person who said yes to it was lying?

ask the person who said yes to tell her he/she was just kidding

explain to her how you need sperm and an egg to get pregnant, and without a male there is no sperm. thats the best way I can think of.

dear tell her there is one way only and you cant get have a baby that way you would google it and and show her that what you said is turn the person that side that is just lying to her there is no way I hope that helps you