Why would a Girl bump into me?

Last night this girl I work with just randomly walked into me and afterwards she told me to watch where I was going.

Earlier that night she started teasing me and going on about how she was going to go crazy on me.

A part me thinks she likes me and another part of me thinks she's just having fun and maybe that's just part of her personality.

So is it possible she likes me or Is she just friendly? I don't want to do something stupid and make things weird between me and her?
Why would a Girl bump into me?
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