I wouldn’t see the problem either if both parents worked all week and wanted a break. But she already sends them to Mazza and nursery 3 days a week so she can swan about the shops and get her beauty treatments done. She can claim that her parents want to do it but in reality they just enable her behaviour and are clearly worried about upsetting her.Got to say I don't see a problem with kids staying with grandparents every weekend. It's not really a big deal per se. However she does come across as though she doesn't like being a mother and wants time alone whereas most parents who have childcare every weekend would probably be taking the offer for a break and a sleep, not nights out each week.
I do agree with the other comments though that it’s probably better for the boys this way. She has realised from early on that she can’t cope with them and so has put in place ways for her to cope, mainly other people looking after them. Look at last Wednesday which is her one day a week on her own with them and she took them to at least 4 places wasn’t it?