I don't think it's ever got in the top 100 for the day on Itunes either. This is updated every day- https://music.apple.com/us/playlist/top-100-uk/pl.c2273b7e89b44121b3093f67228918e7 and checked the day after it came out and it didn't make the top 100I get the chart figures every day and she is not in the top 100 singles.
Itunes chart I believe is live, so if 20 people buy it in a minute it might go high in the live chart but fall minutes later without constant sales.