Michelle had hers taken out just this summer as they were leaking into her system and she became very unwell with autoimmune issues. She's become an advocate for recognising and diagnosing implant related illness.
That's why she sometimes looks a bit under proportioned on top in comparison to the rest of her, it's because until recently she had ginormous boobs and her shape hasn't adjusted yet.
It may be that talking to Michelle was the final thing for Shirley.
I think it's a pretty brave thing to do, cos you know your shape is going to be completely different and you're post menopausal and fighting your middle anyway. And of course the likely reason you go them in the first place is cos you were unhappy being flat chested and this does propel you back to that. Michelle has spoken about being able to accept her natural body as she's older now in a way she absolutely couldn't in her 20s, and trying to teach that to her daughters.