When should you ask someone out?

A while ago I was talking with someone on Amino (a chatting/blog app) and she asked me out after only sending 6-ish messages to me. I declined but I kept talking to her to get to know her better and decide if I want to date her later down the line. She kept bugging me and didn’t reply to any of my messages and just kept asking me if I wanted to date her. I responded with “no, it’s too soon. I don’t know you that well”. She replied “there’s no such thing as too soon”.

I stopped talking to her a while ago, but I wanted to know everyone’s opinions on this. I myself have never asked anyone out, so I have no idea if this is a common opinion or not.

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