She can apply for homemaker credits now, if she wants to. My missus did it through MyWelfare.ie and received them a few weeks later.
But, as you suspect, they won't be any use to her unless she can cross the 520 paid contribution threshold.
How to apply
So the answers to your two questions are:-
1. See above.
2. The only real "mechanism" is for her to get a part-time job (as mentioned above) that would enable her to pay Class A contributions.
Incidentally, State pension age is 66, not 65.