Ringel's jaw drops for a moment, and she reflexively stabs forward with the ranseur; but she can very easily tell that just will not do the job here. How is this forest growing these things?! Instead of an answer, she merely gets a flurry of bites rain down on her and a few more necks snake around her torso to get at Tanna-Mai. Very not ideal.

Without much in the way of further hesitation, she slides he left down on the shaft of the spear, folding the weapon behind her back as she swivels around; hoists Tanna over her shoulder without further ado; and scurries around Novalis onwards on the causeway, trying to keep her head down, but also between the heads thing and Tanna and maybe on her own shoulders. Hopefully, the thing won't be able to just eat them both in one bite. Hopefully.

Spoiler: OOC
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Okay, here's the numbers:

AoO against the approaching Hydra: (1d20+12)[24] for (2d6+8)[16] magical piercing;

then: free action free up a hand and declare Dodge against the Hydra, initiating being on the defensive and increasing that AC to 19,
move action pick up Tanna-Mai (interesting fact: with the +2 to STR from Elation, she's just within light load!) and
other move action move 55 feet to whatever direction the crew were moving (I'll assume north, so she should end her movement somewhere around V9).

Picking up Tanna-Mai should provoke an AoO; if Novalis acts first, moving shouldn't, but if it still does, Ringel has Mobility for AC 23 against that AoO.