Hi aimc
Let's take this in stages. Your sister took a legal action. Her solicitor told her that he would not charge a fee if she lost the case. I think most people would understand that they would have to pay the costs of the other side if they lost their case. I don't know what the solicitors are supposed to tell their clients. They should be obliged to tell the person that they face a big loss if they lose their case.
Your sister lost her initial case. I really find it very hard to believe that in deciding whether to appeal, your sister did not think of the cost implications. Again, the solicitor should have explained them to her and given her some estimate of the cost of the appeal.
So where does your sister stand now? The other side has a right to their costs and your sister has an obligation to pay them. If someone sues me and loses their case, I would want my costs paid. They can't get blood out of a stone. If your sister has no money or no house, then they won't be able to get the money from her. She won't be jailed for failing to pay a legal debt if she has no money. If she has a house, they can get a judgement mortgage against her. This means that she will be unable to sell the house without paying them first.
Your sister should make a complaint to the Law Society. If they find in her favour, they could order him to pay her costs.
Eamonn666 and NoelC - I know exactly where you are coming from and you have a right to express a view, but could you be a little less aggressive in expressing that view , particularly to newcomers?
Brendan