Problem is Jeff, ex W lives in South Africa - meeting in Europe is, unfortunately, out of the question . This is a really difficult one. If the kids go to visit her, there is no where for them to stay as she shares a house with all these other people. She cant afford the airfares for the kids. The kids are desperate to see their mum. I have no doubt that she is desperate to see them. If she travels to the UK under her own steam to see the kids she would have to stay at friends or in a hotel and the kids would have to go and visit or she would have to come to the house.
I sort of thought that by showing compassion regarding her situation and offering a solution to seeing the kids, may start the process of realisation of what she has left behind.