1. It is unusual for a Druid to run nonliving/psychic immune creatures, so you can get a lot of use out of your psychic spells. Mind Control is probably not worth it, but Charm and Pacify can work wonders.
2. Thoughtspores and Psyloks are flying, so they aren't hindered. Psyloks have critical attacks, which can be useful for getting through the Druid's armor.
3. Use armor ward to protect your boots. If the Druid is dissolving at vine range, it is unlikely that she will have enough mana to overcome the extra 4 needed to bypass it, so you can waste at least 1 corrode that way.
4. Forcefield. If the Druid turtles in the corner, she can't dispel it, and if she comes after you, the hindering vines don't really matter.
5. Use force pull to bring the Druid to you.
That's all I can think of for now.