Where the Gospel describes His early years, Mary would see Jesus do some unusual things. On the way back from Egypt, He wandered off from the caravan; they found Him in a temple amazing the teachers and scribes with His understanding. According to the Gospel, she "treasured it in her heart."
I believe that meant she didn't discuss the matters with others, but pondered on them.
She knew he was the Messiah so I think she expected some pretty amazing things...
She had an Angle appear to her and say you are going to have a child the son of God.
Yep, I think your right she expected some really interesting things were going to happen.
Just had to through that in /s