Girls overthink things it could mean she doesn't trust you because well girls are vunarable to men who are naturally stronger. Other reasons can be shes been played before and doesn't trust guys who want to meet straight away. Or she set a rule for her self to get to know a guy before she meets him.

Literally it can be loads of different reasons or more then one. Best advise i can give is to be persistent when setting up a meeting with every girl until its clear you have no chance to meet her. But in your persistence it's important you don't come of too desperate, If you're sure its not happening. You act like its not a big problem and you will be a good boy 'lol yeah right first chance i get to flirt innocently am taking it because now i have nothing to lose attuide' ( which is confidence girls love it). I say something along the lines of "oh well" sometimes add "ohh well that's to bad" ect just say what you think is kool am 100% sure people have better lines lol.

Next step is to act like you don't really care about her rejecting you because you gave other chicks on the radar. text her less often and don't start texting her everyday, if you are stop texting her everyday.

If she says no once it does't mean for every girl that they are not interested in you, but its safe bet to be less invested and to go out and find another girl. You could also stop talking to her for couple weeks a lot girls will talk to a guy they rejected softly if they haven't spoken in a long time but it doesn't mean shes all of a sudden got a hard on. your still going to have to put in work mate.

Info from research, books, field test, active cheaters and players.