A girl i need help with?

Well a girl i have been talking to for 3 months now , ive met her once , i now said to her a few days ago , your welcome to come mine tommroow or next week' she said ill feel how i am tommorow due to the fact she has been on some sort of walk thing for 2 days , then the sunday which she might of came round mine , her phone wasnt sending or recieving messages, which ifound out by my mate adding her on Bbm and that was her status , so she didnt come round . I asked her today ,your welcome to come this week and she just rplied ':) xxxxxxxxxxxxx' what should i say back im getting really frustrated!!!