Does it even matter? If you expect a comparably low pension and have some savings, and a high risk avoidance and low knowledge to invest (compared to many users here, not necessarily representative for either CH or IT), an average pension fund might be just the thing, even if your one-time tax savings are very low.
With 3a, she’d still have close to 0 return, or a direct investment risk (which she seemingly doesn’t want), but with pillar 2 she doesn’t.
Plus the option to get the pension, whether it’s 4% or 6% conversion in 10 years, or (partly) withdraw in case there’s higher cost e.g. for renovation etc.
Ma0’s comment above does sound harsh, but most things have been said in here.