Why does she care if I delete her number?

[New Guy]

So this coworker I was talking to for about a month deleted me from instagram after I deleted her from Snap Chat. I only deleted Her from snap chat because I think she got the wrong idea from all the snap chats I send her and the rest of my friends. She texted me a paragraph saying we were nothing more than friends and she had no intentions of being more. I said "haha same here. I'll stop texting if it bothers you though". She said No, it doesn't bother me. You're good." And we left it at that.
I deleted her number which deleted her from Snap Chat. A few days later she deleted me from Instagram.
Why if she just wanted to be friends?