Texting her right when you get her number is definitely the best way to make sure that she gave you the correct one. It also gets a message screen of your text popping up on her phone. When she gets this new text-message box, she’ll presumably add your name so that she knows who has texted her. This familiarizes you even more to her and sets up your future texts. She’s more likely to respond to the texts thereafter.
The first thing I will do if she does not answer my text, and I know (just by the way she was texting me before) that she definitely received it by now, is send a text like this, “K sounds good lol” or even one like this, “All right hun that sounds Awesome lol.” Both of these make light of the fact that she didn’t answer you. They are short and sweet. They do not blow it out of proportion that she ignored you. Instead, they make a joke out of it, and they usually work to get a response.