try to test-water abit or observe more hints.
E.g. of test-water, 1). smsing more to her seen if she the one who
initiate the "ok, i something to do, gd nite, byebye" or "sorry,
chat later"
2). chat on phone etc..
3). Outing time, offer to buy her drink see if she will accept or
not, or say nono- i pay myself etc....
Even with the above, cannot be 100% sure. 
