Well... I can transform myself into something that can breathe underwater. Maybe for you though... I could probably get some of the underwater wildlife to push some bubbles into your bubble and give you some more time.

[ She's not sure how effective that would be, but it's something, right? ]

Plus, if you run out of air, I'll be able to swim you back to the surface faster than normal, and I can heal you as well... though if we run into a Fuath we might have to run. I don't have much that can deal with them...