No, Kikuichimonji is right. If a you do a lightning car C on Mitsuru at max range or so and she actually blocks it, it is completely safe as far as I know. If you're getting lightning car C punished on block by Mitsuru when used at range you're doing it wrong.
Anyway to beat her jab straight on you can do
1. Lightning Car C for low profile
2. Sweep for chest invulnerability