Kerrias trigger rate is .36 at max so that means that she needs a heck of a lot more skill act support than Dendro does.
Dendro is a natural first turn girl that attacks all one time with all she's got then flames out
Kerria is a natural long game girl with dodge and defense along with hellacious attack on one.
Dendro doubles her trigger on the first turn so that means you can run three normal 1.2 skill act girls or only one that does 1.65 on the first turn like Daisy.
Yes you can run them together but in order to do that you have to force Kerria to be a first turn girl
I am going to do that using Daisy, Waterlily bride, and Cymbidium.
I am no math wiz but Daisy and Waterlily bride only multiply the .36 by 2.3 or 82.8% chance to make her use her skill. So she needs more and more than 1.2 normal to reach 100%. Until we get a 1.36 girls Cymbidium will have to do to guarantee 100% that Kerria uses her skill.
I believe this will work on normal maps

EDIT
Got Waterlily bride up to lvl 50 and gave it spin
and I don't recommend putting Dendro and Kerria together because trigger team wastes her. Most of the time everything is dead before Kerria can get a crack at them and moving her to the front she is wasted there as well. Kerria is better to put on own team maximizing her own skillset. Dendro doesn't need that much extra power anyway
I really like Waterlily's skill animation shes a keeper
You might try a trigger team setup similar to this with your new Fritters since she gets all her kickers out of others skills going off. I would if I had her
Dendro team just needs three girls with regular skill act as she does enough damage and the remaining one should boost ATK
Kerria needs everybody to have skill act, and when the debuff girls bloom that have skill act, she will become virtually indestructible except by maps the devs create to counter it
Fritters I think will be a trigger team setup that works best Multiple 1.65 girls and /or cymbi and a girl who tacks on additional skill damage would be good.
There that's 3 teams...just figure out what support girls you need to add to pull it off. Good Luck