Social Help What does it mean when a girl you don't know but work in the same play says "sorry for bothering you"?

She said Hi first followed by my name first then I said Hi and then her name back to be nice and respond but she said Sorry for bothering you and she said she keeps bothering me? I said oh no it's fine but I wish I said no bother at all? Do you think I should tell her that it's just it makes me confused as I wonder why she even says that? We just both work in the same company and she works in a different department but she usually says that to me when she sees me in the kitchen really? We rarely ever have anything to talk about? If I have to be honest I do like her but I just am awful with social stuff cos of aspergers etc and I don't know if she likes me because she said sorry for bothering you that means she doesn't want to be near me I guess or am I just being negative?