No, quite frankly, I don't think so. Even if it helps at first, it won't for long.
The Irish have a special status in the UK so she should not have any trouble living here.
https://researchbriefings.parliament.uk/ResearchBriefing/Summary/CBP-7661
"Irish nationals have a special status in UK law which is separate to and pre-dates the rights they have as EU citizens.
In short, the Republic of Ireland is not considered to be a ‘foreign country’ for the purpose of UK laws, and Irish citizens are not considered to be ‘aliens’. Furthermore, Irish citizens are treated as if they have permanent immigration permission to remain in the UK from the date they take up ‘ordinary residence’ here.
This special status affects Irish nationals’ rights across a number of areas, including eligibility for British citizenship, eligibility to vote and stand for election, and eligibility for certain welfare benefits. It is thought that, as a result, Irish nationals have more rights than other EU/ EEA nationals resident in the UK."
You can of course research the Spanish social care system of which I have no knowledge, but the fact remains that she would be on her own, and trying to keep tabs from afar will be very difficult.