Blah, it's always hard when you start indirect.
If you got her number by stating interest in her, escalating now would go much faster.
Or not at all if she wasn't interested back.
What you'd have to do now is speak to her in person, create rapport, state your interest (tell her she seems like an interesting girl and you'd like to know her better) and ask her out somewhere.
Since you started texting, let's see how we can make this conversation more interesting:
"Better idea, you're coming with me. If it goes wrong, at least you'll keep me company.

"
or
"Better idea, you do it. Use your female charm and it should be a piece of cake.
If it falls flat I promise to keep you company.

"
If the conversation has gone cold, you don't need to send these as it might appear try-hard.
What is important is that you get the idea, for future texts try to flirt, be playful and escalate.