On a side note:
I don't know if this is normal for NEW players to reading, but regarding note interpretation: I find it really difficult trying to get my brain to shift between the upper and lowers staff. I realize that the notes just repeat from A to G, but the staff lines look so similar I get mixed up when I'm reading the upper G staff for example and then jump to the lower F cliff staff.
There are those little riddles we use, but it's so difficult to think about that when your brain is trying to interpret the fingers notes and then the upper and lower staff notes. I suppose all this will just take some time.
The mnemonic system for reading notes, while seemingly beginner friendly, actually requires a lot of work. The trade off for the gentle learning curve of this approach, is that when students gather up more experience playing music and want to advance their reading fluency, they are held back by the methodology of this system.
Let's look at the steps to read a single note with the mnemonic system:
1. Identify the clef
2. Identify if the note is located on either a line or space
3. Based on the information in steps 1 and 2, recall the appropriate mnemonic
4. Using the mnemonic, count up the lines or spaces till one lands on the note in question
5. Recall key signature and identify any accidentals
6. Based on steps 4 and 5, identify the note name
7. Using knowledge of the name of the note, identify the key on the piano associated with that note
8. Position hand and appropriate finger above note
9. Play the note
That is a lot of steps for just a one note. In addition, mnemonics generally don't extend their rhymes into ledger lines, so there is even more tedious work to do with ledger line notes.
Now look at the landmark system, or landmark notes (do a google search for details on the technique). The basic premise is you learn a few landmark notes, and use these landmarks to help locate all other notes. It encourages students to think about intervals, as well as employ more intuitive thought as to the locations of notes. There are no mnemonics to remember, and there is no need to translate a mnemonic to a note name. It is a much more direct approach to reading music, as one deals with the notes themselves. Also, one is given a better sense of spacial awareness on the staff, location of notes in relation to one another, and the skill to approximate the location of a note.
Using an analogue example:
Say you are given a number line of integers from -20 to +20. The question is, where is number 5 located? The landmark system would have you thinking intuitively with intervals, where you can say: 5 is not negative so it is not left of 0, it is not greater than 10 so it is not to the right of 10, however 5 is between 0 and 10. Contrast this to the mnemonic system that would have you count numbers until you reach 5: minus twenty, minus nineteen, minus eighteen..., then translate to numerals: "five" translates to 5, and so on.
The next level up in note reading efficiency I call the pictograph method (not sure if there is a standardized term for this, but this is what I am calling it at the moment). In this method the clef, staff, note, and duration are all flattened into a single pictograph. In this way there is no need to identify a clef, a note or a duration, as it is conceived as a single image. The thought process would be:
pictograph = sound = duration = key on piano = haptic sensation in hand
It is a singular sensation without the need to deconstruct it into its components. Naturally, it will take a certain amount of experience to get to this point. It is analogous to how one sees printed words in a familiar language - a collection of characters is immediately and intuitively perceived as word, along with its meaning and pronunciation, without the need to work through each character of the word in order to decipher it.
The pictograph method will very easily scale up with complexity, used with recognizable patterns, as one progresses with music study. For example, an arpeggio. It can be read as a single pictograph, as opposed to a collection of individual notes.
The takeaway for all of this is, try to move away from the mnemonic system of reading. As you have discovered, it can very easily lead to workflow overload.