I do like the idea of Shyvanna being a viable hybrid champion, and I think the E change is elegant and helps with her kitability issues without being an overly strong buff. Similarly the increased range on her AA during her ult thematically makes a lot of sense and is consistent with similar abilities.
The CC immunity clause on her Ult is way overboard though. Her ult provides a sizable durability boost, a gap closer, a knockback, and adds a whole lot of AoE to her kit. It would be, in the majority of situations, a much stronger version of Olaf's ult (potentially lower cooldown thanks to on-hit fury generation, triple the duration and duration increases with AAs, provides an AoE nuke/gapcloser/knockback, and adding AoE onto all her abilities is far stronger than the armor pen and, while active, stronger durability buff). Otherwise, good ideas.
I was really just wishing for the anti-CC while in flight. I don't care about breaking CC as much as ignoring it while in mid-air.
I'd be perfectly happy with cutting it down to three parts: On-hit effects on Flame Breath, longer auto-attack range in dragon form and immunity to CC while gap closing.