Okay
@Neil *********
posted in another thread which I deleted that his foreign g/f has been on an overstay since her entry stamp expired on March 22 .
Now I don't why they didn't get an extension BEFORE that stamp expired BUT I found out that she will be obligated to pay overstay from the 22 <- the day her stamp expired up until the 26th when the date they retroactively allowed people to get free extensions from.
So at some point she will owe 4 days overstay at 500 a day, BUT she does also get a free auto-extension until the 30th of April too.
Sorry to have deleted your other post, but at least I found out the correct answer for her/your conundrum..
Good Luck, stay safe