Cool. Yes that's the way it works - a funny kind of deja vu feeling and various images just keep popping into your head. Things remind you ... It's not unusual. All is well.
I would agree this is a strong indication that you have known her before. However. A word to caution and counsel. This does not mean that you are 'meant to be together' (necessarily, although it might) or that you will never have any problems (certainly not! Dream on!).
But these types of relationships / friendships can be very rewarding. These relationships are always important. They are always about 'love' in one way or another - but ... it's never like it is in the movies! The future lies before you, as always, into the unknown.
How have the dreams and your thoughts been going? Do you have any new insights to share about them?
Let us know what happens! Good luck.