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Remember, Grammarly is only software -- it does not understand the meaning of what you write. For synonyms, it will always suggest "mind" when it sees "head." (It is never telling you to change.) And when its sees "mind", it will suggest "head". Like a human editor, it is merely asking if you have considered an alternate word. But unlike a human editor, the software is about as smart as my goldfish.

If you're talking about thoughts, leave it 'mind'. If you are talking about something that is the greatest distance from her head, change 'further' to 'farther' and use 'head'.