How to start the conversation

I'm 22F, I randomly got an account of girl she hasn't mention her age on the account, but it seems she is kinda my age, I sent her a friend request and she accepted, some days went by, I decided to text her

I texted her, Hii

she replied with, Hii

I texted her, where are you from?

and got no reply afterways it's almost 10 hrs since I delivered the last text.. and she was online 2 hrs ago,

Now I don't know If I should re text her or not,

and If I were to re text her, when should I text her..

I'm very confused.