Got written up a week after a stellar performance review. Seems to be retaliation for me complaining about a colleague

I don’t know what to do. Additionally I know my days here are numbered and so after my write up, I submitted a bunch of PTO requests. Normally my manager would approve these, however she isn’t and says she is disappointed I submitted pto after the write up. My company doesn’t pay pto out after firing someone, so I’d like to use it up. Does anyone have any suggestions? I am already looking for other jobs