It was a bad move to ask her to hang out again the same night you first hung out. She really isn't sure what she's doing the next week and she's not gonna say no especially if you had just had a good time so you really don't know where you stand when you do that.
Her canceling but texting you may seem like mixed signals but maybe it's not. She does sound like a busy girl. She could be texting you because she really is busy and doesn't want to make you feel rejected. I guess it depends on what exactly she texts you. If she is flirty... You need to actually think of something fun to do rather than just hanging out at your house again or something like that. If she likes baseball games, or amusement parks or something like that you need to tell her you scored some tickets. Inviting her over to your house may may her think you're just trying to score. A dinner date might seem too formal and an obvious "I like you" kind of date. But if you can figure out a more exciting date to take her on and she's flirty like she was on the first time you hung out you need to just make a move. She'll either reject you and you can laugh it off or she'll be into it.
If she rejects you she just wanted to be friends and she'll slowly faze you out of her life unless you're cool and not an asshole to her for getting rejected. Remember you work with this girl so don't be that bitter dude.
Wild at Heart
That is being a crybaby. Just saying.
