If I remember correctly: she would get a new one when she was baptised as Rosemyne the daughter of Karsted and step-daughter of Elvira in the same ceremony in which she then gets adopted by Silvester and Florencia. I would assume this overwrites the old coin or the first coin just doesn’t matter anymore since there is a spare. Certainly it’s not something Ferdinand et all would just miss.
spoiler
If I remember correctly: she would get a new one when she was baptised as Rosemyne the daughter of Karsted and step-daughter of Elvira in the same ceremony in which she then gets adopted by Silvester and Florencia. I would assume this overwrites the old coin or the first coin just doesn’t matter anymore since there is a spare. Certainly it’s not something Ferdinand et all would just miss.
Spoiler
Yeah, that was my take too. It’s just it’s never specifically said. Probably because Myne is the first and last person it will happen to.