Yes, I do think she has been introduced, and she is none other than O Tama and the retainer is Tenguyama Hitetsu. Well, it makes perfect sense for me.
O Tama, or Hiyori, was in Wano from a year before Ace arrived. So, when Ace would have arrived in Wano, she would be around 3-4 years old.
By the looks of it, she will be barely seven years old right now. So, it does make sense that she was sent about 14-15 years ahead in time by her mother, Toki Kozuki.
We know for certain that Tenguyama Hitetsu has been looking after her from her childhood, and he too has been waiting for someone for a long time. It makes sense that he is waiting for his mates Kinemon, Kanjuro, Raizo, Kiku and his master lord Momonusuke Kozuki. We also know that O Tama has been living in the outskirts of Wano country from the start which indicates that Hitetsu doesn’t want her to get noticed a lot.
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