His AoA beats her DB, so I like to end blockstrings with that more than I would against other characters. She'll pass overhead and land behind you, so you can punish with:
5AA > 5B (1) > 236B > 4B > ...
Microdash grabbing works after a blocked rampage like half of the time, and I suppose 214B would work the other half.
Grab beats her 2A and 214C/D/CD, though Chie rarely uses Dark spot there.
If you punish a DB before she hits the ground, is she in counterhit state?