Is this a normal step?

So the lady I've been taking this slowly with has decided to give me a little bit of clarity. Her exact words were 'currently I refer to you as my best friend, but I'm not friend zoning you with that term'

I'm abit unsure if this is a normal step in the buildup of a relationship, she is very guarded and slow to trust. This sentence just made me feel a bit shaken

Is this a normal step?
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