na... if she doesn't wanna go, don't force her la.
but after you meet your ex's sis, go meet her. talk to her.
you should be able to confide in her how you feel or what you need
from her.
just have a heart to heart talk with her la. when you two keep
quiet, (she not wanting to burden you with her fears, you not
wanting her to see you anxious/nervous/or how affected you are
about this) all that's unsaid hangs in the air... and that's
worst.
Talk it out. be transparant to her, and her to you. you two can get
through this together
