https://digi581sa.z44.web.core.windows.net/research/digi581sa-(419).html
The safest guess is for the mother of the bride to wear a similar shade to the bridesmaids to remain on-theme.
https://digi570sa.z31.web.core.windows.net/research/digi570sa-(468).html
We love spring colours like blush, gold, pale green, and blue along with floral prints for mom of the bride attire for spring weddings.
https://digi42sa.lon1.digitaloceanspaces.com/research/digi42sa-(116).html
Metallics are a great different to neutrals, as are floral prints in complementary hues.