She desperately tries to fight against the tide knowing she's never been strong. The waves are overpowering. Ignoring her struggle they continue, battering her physically, emotionally. She is losing her fight to get to where she needs to be. Tempted to submit, let go, give in, she relaxes her exhausted muscles, her exhausted self. Holding her breath and letting the current control her she resigns, just for today and let's the tide decide that it will take her back to the shore. Maybe she'll begin to end it all again tomorrow.
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I wasn't intending this to head in this direction but I liked the idea of the reader believing that she was trying to save herself rather than actually trying to drown herself.