Hair/makeup for bridal party

So long story short, i have my makeup booked for the day of the wedding. I had originally talked to a hair stylist and planned on having her- put she does not offer a contract which freaks me out, and she is not active on social media, barely has photos of her work.

Last month i asked my bridal party about who wants what services. At the time i gave them the prices of the hair stylist who wont offer a contract.
Since then i met a great hair stylist duo at a wedding expo, great reviews and work. The only issue is her services are $10 more then what i told my bridal party.Do i message everyone and ask if thats okay, or do i just pay the extra $10 per bridesmaid to cover the new cost?. My wedding is in october