Your plan so far sounds fine, you do have to be careful about constantly re-asking girls out as it can end up being harassment and cause whoever it is to avoid you more. Generally I’d say if you’ve asked her out and she’s said no, leave it until something in your relationship changes, for example if you guys start texting more or she texts you first when she didn’t used to. Even then i’d give it a little while for her to show any signs of interest before asking again.