Not an expert either, and a lot would depend on all three of your personal circumstances. It is reasonable to revisit this with your ex and possibly your daughter and say, normally I pay €x a month towards maintenance, how do want to work this now you will be moving in with me.
Remember college runs for 26 weeks, so it is possible she will spend the other 26 weeks, and possibly all weekends in Limerick.
Her mother would still have roughly the same household expenses if she lives there half the year.
Your €x per month might be fairly nominal by now depending on your divorce agreement, so is it worth the discussion?
You might consider other options, such as buying her a car and covering running costs so she can move easily between both households.
Giving your daughter that allowance to cover clothes, transport, books, makeup, sports, entertainment, etc, etc. or else continue to pay your wife the maintenance and allow her to give your daughter a spending allowance.
Also if she had decided to go to uni in Dublin you could have ended up shelling out €10-€12K for her costs there, so count your blessings.