Old friends?

Sooo an old friend texted me today asking to hang out tomorrow, but she hasn’t legitimately talked to me in like two years. She is such a different person now that I honestly don’t think I want to hang out with her, but idk I feel like I should just hang out and see whats up. We’re both just completely different people and I don’t get what suddenly sparked her interest in talking to me. We never had any issues with eachother, I moved schools and just didn’t get to see her enough to continue a friendship. Should I hang or just say I’m busy?