Why she suddenly stop texting after doing it for a while?

Okay I asked a girl out, she said she not ready to date and never had a boyfriend before. Then she got my number and we started texting each other a lot. That's when we became good friends. We did that like 4 months we were like fwb's. Until now she stop replying I just sent her like three texts one saying are we still friends another saying can you please tell me why you're not replying so I can stop wasting my time. No reply to any of them. It's been a month since she's replied. I though the ***** needed "space" so I waited a week and a half no I know something's wrong what do I do.