When we took our first family trip in 2002, my youngest DD wa 18 months. She was afraid of the characters - she didn't cry, but didn't want to walk over to them and have her picture taken like other DDs. So, in most of our pictures, DH is holding her. Sometimes, she would glance over at the character to check him out, other times she would just cling to DH. When we went back 2 years later, she was still somewhat skeptical. She still wouldn't approach them by herself. She would stand with the rest of the kids without DH though. This past year, she was 5, she would run up to the characters and give them hugs! She loves them now. I think that exposure when she was younger helped her to ease into her comfort zone. So, even if your sister is afraid of the characters now, hopefully seeing them will help her get used to them and maybe on a future trip, she won't be as scared. I would just recommend not "forcing" her to do anything she's not comfortable with. Just let her take it all in and observe from a distance if that's what she needs. She will have a great time no matter what! Good luck!