Girl's Behavior

Girls, woman turns her head as soon as she sees me?

so this woman in work ignores me and i find it rude. we used to be fine but now its weird, when i walk into tje room and say hello she looks at the guy in front as soon as she sees me she turns her head away. she never bothers to talk to me but seems ok when i initiate. i used to really like this girl but i. dont bother making an effort anymore because of her turning away etc seems to me she doesn't want to even look at me. if were about to pass. in the. corridor last week she sped up walking so she could avoid walking past me. even handing me something she walks up really fast and quickly walks away.
should i ask her if i have upset her? or just continue to not make an effort, she clearly doesn't want to know me.
Updates
+1 y
i have noticed the last couple of days she looks at me quite a bit, she never used to do this. she walked past me today looking at me, so i quietly say hello. after that she more friendly with me again even initiating saying goodbye which she rarely does. its like a complete change.
Girls, woman turns her head as soon as she sees me?
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