Her health has increased, and it has become full for the first time in a long while. No longer is she in a downward spiral towards death, her lifespan has also increased from 230 to 251 years thanks to their blessing.
Access to Mana also caused her level to increase from 25 to 31. That is now on par with the young acolyte. That is just the short term benefit of their blessing on her. So they could imagine the kind of boost the young acolyte and the warrior would have achieved.
The warrior might just reach the limit of the orc race immediately if they had chosen him. But they have already made their choice, so there's no use regretting now. Besides, the potential for her race is 50, and the effect of mana is long-term. So she still has room to grow.
Anyway, they didn't choose her for her strength. So there's nothing to regret.