If you're the one who's going to be paying for it assume that whatever initial bugdet estimate you have will be blown up almost immediately..
Is this the voice of experience? I am about 7 to 10 years from my mother of the bride scene.
In 1989, my parents gave me a budget ($3,000) and I didn't use all of it.
Dissuade your daughter from marrying until she's in her 30s. Once she's been off your payroll for more than a decade, the wedding is on her.
Any self-respecting 30-something woman should be ashamed to ask Mom and Dad to pay for her wedding.