I can't give you specific advice on here, but I can tell you:

Legal Aid will be able to give free advice only, but cannot represent her for her case. They cannot get involved in property disputes. The reason is not because they lack the skills, but because the government does not provide funding for Legal Aid to assist people with property matters - the funding is only available for children's matters, where the parties own little or no property.

With four children in her main care, she will likely get more than 50%. There is no rule that say she won't get 100%, but it depends on the circumstances. Her lawyer can give a better idea of what she can get, and recommend mediation, which is a)compulsory in most matters, and b)cheaper than court action.

FWIW...Legal Aid lawyers are, generally, more skilled, trained and qualified than many other lawyers in the State (and probably the country). They are overworked, underpaid and grossly undervalued. They don't work at Legal Aid for the money or the status - they do it for the love of the job and to help people. Not that I'm biased or anything