What's with her ?

There's this girl at my workplace, I liked her from the beginning, one day, during a meeting, she came to sit next to me, started talking to me, same thing in another meeting the next day , I gave her lift to home that night, and we had a really nice conversation in the way, i'm sure she was also really interested in me as well (through her gestures, etc), I was really happy that everything is going so well and was thinking of asking her out, the third day, a meeting was called up again, same thing, she came to sit next to me, although there was little space, but she forced herself in to sit with me , but after about an hour of same laughing and talking, she suddenly stood up and went away (no mistake made by me as far as i can guess), and she seems to be avoiding me since then , I can't understand what happened, I'm sure i said nothing wrong/weird to her last time, but it's like she's gone "off" suddenly .... what could be wrong with her/me ?

could be she started her periods, or just farted and thought u heard it

anyway......better now than late,

2 things:

1: She may be interested in you to the point she has gone shy and is trying not to compromise anything between you two.

2: She may feel and sense that you like her more that what should be. For this she's protecting both of you, especially from work purposes. Thus only seeing you as a friend and co-worker, nothing more.