The hair can be as long as she wants to make it, It's see-through and therefore is affected strongly by light, so in different lighting it may look like the color of the light rather than like water.
When she grows upset the section immediately under the snowy bits can grow icy be it fuzzy snowflake/icy bits or even outright into a full crown of ice crystals that can extend the more intense the emotion.
Her hair can be stormier when upset as well, the water becomes dark and opaque and has a unsettled seas vibe to the way the hair react.
As for the eyes, they should be the pink of the shell in her hair.
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