Whats going on? Why hasnt she replied?

I met this girl 2 months ago in driving school. We have texted almost every day since then. Im 16, shes 19. I have feelings for her and she knows it. She would invite me to the movies and to the park. Both times we went to the movies we watched a horror movie and she wouldnt even watch it. She would just look at me the whole time ig because she was scared. We literally text all day but the last time we texted was Friday. Im writing this tuesday night. We had a good convo said goodnight and all. And then the next day i texted her but she wasnt active on facebook ALL DAY so i was just like okay shes probably busy. The next morning, sunday morning, she read my text but didnt reply and then went inactive again for the whole day. I got worred. I still am. Monday she wasnt active either for the whole day. Idk why? Earlier today i saw her active so i texted her - her name with a question mark. Right before i sent the text she went inactive again and hasnt been active since. And shes usually ALWAYS on facebook. Idk whats going on. She hasnt read it. She would still get depressed sometimes over her ex and i would try to comfort her. On friday the last day we talked she was a lil sad over him. She doesnt love him she just has like hate in her heart for what he did to her. Idk what to do. I dont wanna spam her or annoy her get me? But yeah why hasnt she replied? If you can help that'd be great.