Yumeki's memory manipulation

While I continue stalling a certain jingyi by not saying anything about the last character's physical description (while providing random chemical description such as carbon, hydrogen, oxygen, phosphorus, nitrogen)
Ok Yumeki-chan, you should at least noe how memory manipulation works before you start doing the memory manipulation. So I shall try to explain in my way how 'memory' works, at least in my world.
You can assume memory to be like tons and tons of data, and the inner mind of a normal human being is somewhat between an organised library and disorganised piles of books.
People with minds that are like perfectly organised libraries are those who have photographic memory and can thus extract and store as much information as they want. On the other hand, people with minds more similar to piles of books would find it hard to recall past events as they are probably covered by more recent events. ie. pieces of paper hidden under piles of books. This assumption is of course that people remember everything that they have experienced and can always recall them, just that they need a long time for more distant past.
So hence when we say that Yumeki used her ability to erase someone's memory, it could mean one of the following three things:
1. She moved that piece of information into a deeper end of the pile of books. Ie. she made a certain memory harder to recall because it seems so distant (when in actual fact it might not be the case).
2. She locked that piece of information away. You can pretend that she took some top secret files and locked them into a box. And the only way to open that box is using a specific key. This specific key would be something that 'trigger' a person to suddenly remember something as we can see during certain drama series. For example the trigger can come in forms of someone's face, description of a place, someone's name, etc.
3. She destroyed that piece of information. Very easy, just like you burn away the piece of paper so that a person can never remember whatever happened because it was no longer stored in his mind as memory.
Also, when we say that Yumeki used her ability to create a false memory, it could mean one of the following three things as well:
1. She takes an existing piece of information, correction tape it (see it as an analogy), and write new things onto it. Hence such way of creating false memory leaves a mark.
2. She takes an existing piece of information, hide it somewhere in the deep piles of books, takes a new piece of paper, writes new things into it and place it at the original place. Such a way can cause confusion when the person realises that he seem to have two different recollections of the same events.
3. She takes an existing piece of information, burn it, take a new piece of paper, write something onto it and put it at the original place. That one is really flawless memory change.
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Ok Yumeki-chan now you noe about how memory manipulation works you can start training ^^ I shall not tell you how to recollect other people's memories and use it for yourself yet. :P