Am i in the clear ?????????

So there is this girl in my college major that i have a crush on for almost a year by now . Despite never being introduced properly irl and not acknowledging the fact that we know each other irl we keep on chatting through text a lot like a lot (we usually end up discussing some serious stuff about idiology and similar topics and we really go all out like we start at the afternoon just to finish at 3am ) . And i reaaallllly don't know my exact postion i am still really paranoid i remember asking her once a question that i felt was a bit risky and she was like "hahaha i will think abt and tell you" so i thought that i went too far and figured that that was a nice way to evade the question (this happened at 4pm) but to my suprise i woke up the next day to a detailed text(around 10 lines of text) sent at 2 am which really caught me offguard because i didn't insist on receiving an answer . Anyway what do you think and what signs that would assure me that the interest is mutual ?