Does Merkaba Meditation do this?

Beloved brothers and sisters,
i am here tonight to share an experience with you that i am unable to understand and that is with me all day. So, last night i was in meditation to activate my merkaba. this i do since about a year, almost every day. the experience is sometimes very special, nice, and sometimes quite "normal" without much remarkable happening. last night it WAS special. i felt it when i started the spherical breathing. my inner eye saw a tunnel which had an endless flower of light lining all its inside. it was like with every breath it moved me forward but at the same time, i stayed in the same spot -or else, the tunnel did not end. after the 17th breath (this is when the merkaba starts spinning) i stayed in meditation for a while like usual. at that time i just "felt" a beautiful feeling, i did not "see" much. coming back,out of meditation and wanting to go to sleep, i stood up to open the windows for the night and i opened my eyes for that. right in front of me stood a human like figure, all white and transparent at the same time. there were no colors, just a plain kind of shiny white. she scared me out of my wits and i almost screemed. the figure slowly vanished, it never moved, just fainted more and more until it was gone. i stood up and could walk right through the place where she had been. i felt so sorry when i realized she might have left because i was so scared. i did not want to offend her by being scared - it just happened. i never had an experience like that before so hope she forgives me.
Now, my dear spirit friends, i don't know who she was - nor why she came or from where. did anyone of you have a similar experience and may help me understand. i cannot stop thinking about this...
Love & light to all of you *akasha*