Check the mod priority guide:
https://docs.google.com/spreadsheets/d/1ty239kyJbBs1sLhTo1JvSWuN0mIJsK1nwVdI6OLLtXo/view?rm=minimalWhile not an outright terrible upgrade, G3 sadly continues to be weak in the grand scheme of grenadiers.
Let’s start with the good: her raw stats get a good buff that helps her offensive capabilities, plus she gets improved values on her grenade and her tiles. On top of this, her tiles finally face forward and she has a decent Special Equipment.
That probably all sounds well and dandy, but she still has notable faults. She still has poor DPS compared to top grenadiers thanks to her low Rate of Fire and an underwhelming Skill 2.
The Freezing Point of Courage gives her grenade an additional effect depending on the enemy health. Enemies hit below 50% HP take additional damage, while everyone else gets stunned for a brief moment. Sounds good, but in practice does not offer much benefit. The additional damage will typically only add overkill unless against very high HP enemies (which shouldn’t be fought with grenadiers in the first place), while the stun comes out too late to hinder enemies effectively.
G3 lovers will probably find an alright upgrade that will satisfy them. For most people though, there is basically no reason to upgrade her. The one niche she did have, which was being able to corpse drag 11-5, is now irrelevant with 13-4 and 12-4E being available.