This has happened on my nails.
Had a client have this happen to them, so I did a little testing on myself.
Did all steps as recommended, then cleaned the bath with 'Cif', one hand with rubber glove on, one without.
No suprise, the one without the glove lifted off, just as your picture shows, the other stayed perfect for just over a week! ( I'm a hairdresser, so a week is a good result for me!)
Not saying this is what happened to your client, but it is possible, these products are not invincible