(I've done a little poking around the internet and have rewritten this post like five times so some parts may be repetitive.)
Poking at various online gardening resources it looks like western vs eastern side of the range has different climates. West end is more like the main body of France, eastern is more Mediterranean. Western end also gets more rain than the eastern. Your lady sounds like a serious gardener so that will get her some play in what you can grow. I'm most familiar with US classifications and that part of France is zone 6 or 7 depending on how high into the mountains you get. It's a very forgiving grow zone. In general a cooler color scheme of white, pinks, blue, and soft purples are traditional in French gardens.
Roses and lavender are what comes to mind as traditional French garden flowers. Given she has a vegatable garden she may play with various sages, thymes, and alliums in her flower garden. There are both functional and decorative versions of those. Trimmed boxwoods are part of more formal gardens, but not always seen in less formal ones. Lilies would work. It looks like some kind of pots or planters for things that need to be moved indoors or into a greenhouse for winter are popular options.
Some kind of structure (arch, pillar, pergola) with climbing roses, wisteria, or jasmine would be expected. (If you can't find a tree maybe your character could cry under a structure covered in a flowering something or other.)
There's a Wikipedia page for "Flora of the Pyrenees" that talks about native plants: https://en.wikipedia.org/wiki/Category:Flora_of_the_Pyrenees (There's a Sweet William variant local to your story with red centers and white outers that I had to look up to see if I could have it in my own garden, but alas zone 9 isn't friendly to that particular varietal.)
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Poking at various online gardening resources it looks like western vs eastern side of the range has different climates. West end is more like the main body of France, eastern is more Mediterranean. Western end also gets more rain than the eastern. Your lady sounds like a serious gardener so that will get her some play in what you can grow. I'm most familiar with US classifications and that part of France is zone 6 or 7 depending on how high into the mountains you get. It's a very forgiving grow zone. In general a cooler color scheme of white, pinks, blue, and soft purples are traditional in French gardens.
Roses and lavender are what comes to mind as traditional French garden flowers. Given she has a vegatable garden she may play with various sages, thymes, and alliums in her flower garden. There are both functional and decorative versions of those. Trimmed boxwoods are part of more formal gardens, but not always seen in less formal ones. Lilies would work. It looks like some kind of pots or planters for things that need to be moved indoors or into a greenhouse for winter are popular options.
Some kind of structure (arch, pillar, pergola) with climbing roses, wisteria, or jasmine would be expected. (If you can't find a tree maybe your character could cry under a structure covered in a flowering something or other.)
I found this article that runs through French garden design and recommends specific plants: https://www.chezpluie.com/blogs/news/8-ways-to-create-your-french-garden
There's a Wikipedia page for "Flora of the Pyrenees" that talks about native plants: https://en.wikipedia.org/wiki/Category:Flora_of_the_Pyrenees (There's a Sweet William variant local to your story with red centers and white outers that I had to look up to see if I could have it in my own garden, but alas zone 9 isn't friendly to that particular varietal.)