Deleting problem on SD Card

My sister shared an issue.
For the past two months, every time when she tries to delete content from an SD Card, the option to delete anything doesn’t even appear. she has tried formatting the cards and she gets the message “The disk is write-protected”.

I thought it may be her digital camera doing it because that is where most of the sd cards are used. So to check this possibility, I tried a card that had never been in the camera; in fact, I had it in her security camera and it was the first time I had put it on the computer. Again, I could not get permission to delete anything from the card. I had found an article on using command prompts to unlock the card. It did not work either.

And they are not locked with the lock on the side of the card.
Any ideas to fix?