She was interested, but now seems distant?

I work with someone that showed interest in me (brushing against me, laughing at my jokes, curling hair with finger etc . ) but now seem real distant .

We only see each other once a week, but she's been away lately and when I see her next time, it will be a month since our last contact . I IMed her on 4 occasions, the first two occasions, she ignored . The 3rd occasion, we talked for about 15 mins and then she had to "go do some work . Later <3" . I waited a week to contact her again (4th occasion) asking her if she's coming in to work tomorrow since she's been away for so long . As I was typing the msg, she put on her away msg "going out" . I sent my msg about 2 mins afterwards and set my away msg on as well .

About an hour later, she replies with just "yup" . (I did not leave yet) . I replied back saying "its about time, haven't seen you in forever" . Then about 2 mins after, she signs off ! Then 2 mins after that, she signs back on .

I didn't msg her again . I'm not sure what's going on anymore . She seemed so interested before, but now it seems like she's not anymore .
She was interested, but now seems distant?
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