I look like a neon zebra shaking rain off her stripes
This could mean she was wiping the tears from her face as they shared her “scars” (past mistakes and pains)
This might also mean she is no longer able to hide her feelings towards him since they opened up emotionally, and now the jig is up. Since zebra’s stripes are meant to conceal them from prey, being neon means it’s no longer concealed anymore.
Fiona has a history with self harm and many times when you have a scar it heals lighter than your skin. I think neon zebra is referring to her literal scars.
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