Does masturbation - without direct touching - invalidate the fast in Ramadan, and what is the ruling on the past days when its prohibition was unknown, and how many days need to be made up?

It is clear that the questioner is suffering from obsessive thoughts in this regard. As long as the act did not result in ejaculation, there is nothing upon her, neither making up the prayer nor anything else. It is advisable to abandon this act, as it may cause obsessive thoughts, fantasies, or harm. It is also advisable not to dwell on these suspicions, delusions, and obsessive thoughts. The best cure for these obsessive thoughts, after seeking Allah's help and relying on Him, is to disregard them and not pay them any mind.