I had a good conversation with somebody who I have only had one other conversation with in the last 2 years, I still have her number should I text her something?

The reason I haven't talked to her in a while was because I had a really bad falling out with her over something that's beyond embarrassing to me. Not a romantic relationship (although I think she found out I had a crush on her and may still know that), but we were okay friends. We still say hi to each other sometimes in the hallway. Anyway enough context, what should I text her, or should I just not text her?