Babysitter Needed Autistic 25 Year Old Female During Sister's Wedding

We need someone to keep an eye on Katie so Mom can be involved in the wedding. We anticipate the sitter spending time with Katie at our rented Riverside house during the wedding and then keeping an eye on her at the Reception - which will be held across the street from the house. Kate is mainly non-verbal, but can communicate with responses to yes/no questions, can write many words and can finger spell if you know sign language. She will probably spend most of the time watching videos or on the computer or her iPad, although we do expect her to bust some dance moves at the reception. Wedding is the priority, but if the sitter was interested, we could also use someone on Friday during rehearsal dinner.