Firstly fair play to her - i have a few relatives over and although they have houses here too they just can't make the break for one reason or another.
Secondly overall her finances are in wonderful shape considering the exchange rate.
I cannot give advice really being new to the market myself but i think it is pertainent to ask if she is thinking of continuing to work in ireland when she moves back? And if her UK pension contributions are up to date (in order to understand her cash flow situation fully).