One person can insure as many cars as they like, but AFAIK can only hold one no claims bonus, and with most (all?) Irish insurers that no claims bonus can only be used on one car. So car 1 has her no claims, but car 2 will have to have a full price policy on it.
In the UK lots of companies allow you to share a no claims bonus across both policies, but I cant say I have noticed any here offering the service.
Darragh, really it is a bit of a false economy driving under someone else's policy (also illegal if you are using the car full time). You need to start working up a no-claims bonus sooner or later. Even once you are over 30 starting with 0 NCB is expensive, so you may as well bite the bullet. Even driving on a provisional lots of companies now count your time driving under your own name as starting up an NCB - named driver experience means very little.
Priority one needs to be to get your driving test, the sooner you pass the sooner your driving expenses become less.