I'd suggest that we avoid telling any scary stories with Janet around. She’s a bit unstable and could get hysterical.
A.Janet has trouble keeping her emotions under control, especially when she is told frightening stories.
B.Since Janet is somewhat unbalanced, the only way to make her laugh is by telling stories, but we should avoid scary ones as they might cause her to panic.
C.It is no fun to tell frightening stories to Janet, who is not very stable mentally, because she only laughs instead of getting scared.
D.Janet is somewhat mentally unbalanced and might easily become uncontrollably emotional, so let’s not tell frightening stories in her presence.