upcoming guest says she never saw info regarding security deposit hold when she originally booked last year. How to I show her the original quote that shows it was there and she just missed it.
That depends on the type of booking. If it's a direct booking, the Overview page of the Booking in OwnerRez will have a link to the Quote it came from, and you can look at the emails that were sent.
If it's a channel booking, there isn't a way to see the original quote, because it was displayed by the channel on their site.