Well, your first problem is that you don't have any Fighting-types. Those are the only things Whitney's Normal-types are weak against.
Since you won't have a strong Fighter when you go up against her, you're going to have some trouble, especially against her Miltank. Miltank is tough, hard to damage, and can heal itself in combat, plus its Rollout attack is something Blaze will not appreciate.
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Since you won't have a strong Fighter when you go up against her, you're going to have some trouble, especially against her Miltank. Miltank is tough, hard to damage, and can heal itself in combat, plus its Rollout attack is something Blaze will not appreciate.