Her signature ability is that she has a chance to activate buffs when she or the opponent lands a critical hit, and regen is one of those buffs that is a bit rarer (I think at least). It's not going to be consistent, but it will still come. Try reading her description!
I can explain a bit about her sig ability(i have her awakened 99 for almost 3 years now) her regen at lower sig level has as much chance as you getting 4* from phc(rng sucks bad). Also if you use sw as your main attack try increasing your crit chance mastery bcoz she relies on her/opponents crits to activate her buffs and debuffs. Her best use comes after you get her to atleast 70 sig level bcoz then you have a better chance at regen
The higher her sig ability is, the higher chance she has to proc her regen on a direct hit. When and if she gets regen She will regenerate 20% of her health per regen buff
Comments
Her signature ability is that she has a chance to activate buffs when she or the opponent lands a critical hit, and regen is one of those buffs that is a bit rarer (I think at least). It's not going to be consistent, but it will still come. Try reading her description!
Key words:
Critical Hits
Chance
Buff and Debuff
Its a perk , not a guaranteed ability as SW is not a primary regen champ
Having her at sig 99 with max crit boost team does help quite a bit
All other occurrences are purely coincidental.