6month old has upper respiratory infection goin on day 9 and she's worse. could it have turned into something else?

Perhaps: A cold can last maybe 7 to 10 or 12 days but at this point she should be showing some e improvement, if she is getting worse, like fever, more irritable, not eating or sleeping it might have gone into an ear infection. So if no improvement have her seen.

Yes: Something that starts out as a simple cold can eventually bring o a secondary infection. Issues like ear infection, bronchitis or pneumonia can be secondary events. If you are concerned seek out an evaluation.