GIRLS does she like or why is she ignoring me so much?

Ok I met this girls called Sandra in a bus. She and her friend were sitting behind me and she was touching my hair and trying to get my attention.

She and I both go to the same school so when I was at break with my friends she came up to and said hey! so then we talked for about 2 minutes and she seemed really happy to see me.

The next 2 times I said hi to her and she didn't seem as excited to see me anymore. I added her on Facebook and as we were messaging she gave me her # so I started texting her and after the 3rd text she stopped replying then she said she was busy... So I text her another day and she barely even typed anything and she takes a while to reply too. So after the 5 th text she stopped replying, then I told her" why do you lagg to reply" and she said "sorry I was taking a shower.. ". Iwas like ok, you could have told me that!!!

So I told her I didn't wanna talk to her anymore. Then 1 day later she sends me a GOOD NIGHT N SWEET DREAMS text! I was shocked what I was reading.

So in the morning I sent her a text saying GOODMORING but she never replied. So when I saw her at school I called her name and she barely even turned to look at me! I was like WTF.

now it's summer and I sent her 2 texts- still Ni reply!

I sent her a message on Facebook -no reply

I commented on her status- no reply

I think she is mad at me for talking to her friend, I guess I was flirting a little with her but not really.

So help me!! I really like her but I also think it's my fault for not showing much interest in her when we talk at school.