I thought about her Percheron (French origins) and Andalusian (Iberian/Spanish/Portuguese origins) breeding and came up with this (chat gpt helped!):
“Sylvie” is one of my favorite French-origin names for girls and I think it might be a good fit for her expression and what you’ve described of her personality.
Sylvie means “from the woods” or “of the forest,” so here are some Spanish and Portuguese-origin words for reg name possibilities:
Terms for a forest/pasture landscape/ecosystem or related:
Dehesa (general descriptive term in Spain)
Montado (same but in Portugual)
Dehesas de Sierra Morena (more specific – Morena also can mean “dark-haired”)
This forest landscape is home to the national trees of both countries:
Encina (Spain’s Holm Oak)
Sobreiro (Portugal’s Cork Oak - the feminine Sobreira can also be used and goes well with Sylvie IMO). Sobreiro/Sobreira has been used in literature to evoke some of the same qualities of the important Cork Oak: resilience, longevity, and connection to the land.