She should at least be lodging her illness certs. with SW to preserve future entitlements. She should make an Illness Benefit claim so that it can be decided whether she has the required PRSI record to get paid.
She needs 39 paid in total, plus 39 paid/credited in 2006 year (or 26 in 2006, 26 in 2007). She would have also paid a PRSI contribution for the Saturday work. She will not be able to claim a means-tested allowance for this as Disability Allowance is based on the illness likely to last 12 months or more.
If she is certified fit for work soon, she could claim means-tested Jobseeker's Allownance if her PRSI does not cover her for Jobseeker's Benefit.
An urgent visit to her SW office is required to suss out her options!