Can't remove retweet from someone who recently privatised account


I have a picture retweet that I retweeted from someone who did not have a private profile then, but recently privatised her profile. In normal cases I would just click ‘undo retweet’ and the picture retweet would be gone, but in my case, I can’t undo retweet because she privatised their account, and there’s no undo retweet button now. So basically I’m stuck with a picture retweet I can’t delete. Any ideas on how I can go about deleting it?