Emma may or may not be able to help right now.....but I would be happy to try to help you. I am afraid that I do not know what has happened so far so I will start from the beginning if you do not mind.
1. Is your tank still cycling? Are there any readable ammonia or nitrite amounts? What are your nitrate readings?
2. How long has your fish been upside down?
3. Are there any portions of the fish that are sticking out of the water?
4. What have you done so far to help this fish, besides fasting and feeding peas?
Never be afraid to change the water sooner than your original schedule. If you feel it needs changing, CHANGE it. You do not have to wait until Saturday.

Sometime high nitrate iis the main culprit of flipping. My Puppy, a red/white ranchu, flips anytime I am careless enough to let her tank get over 40ppm nitrates.....
The small red streaks on her belly may be because that part of her is exposed to the air - this is not a good thing for a fish. There are a few ways to prevent this until we get her righted and doing better - the easiest way I know of is to suspend a tank divider or piece of gridded plastic (the kind you find in a hobby store for stitching with yarn or something) just under the surface to hold the fish under the surface. I wire it to suction cups and stick it there. She will float to the top, but cannot break the surface of the water with her belly this way.
You can also hold a pea and feed it to her - place it right in her mouth if you can. Most fish recognise you after one or two tries and learn to eat well from your fingers, whether they are upside down or rightside up.
Sometimes it helps to "walk" a flipped fish - it gets them moving, and, if constipation is the difficulty, movement helps things to work out. I gently place my hand under the water, flip the fish and "drive" them around the tank. Make the fish do the majority of the work swimming, you are simply keeping her upright and under the surface. Physical activity can help with constipation.
Raise the temperature of your tank to 78 - 80 degrees F.
These are all big starts. If you can answer the questions I posed at the top of this, we can analyse the situation better and look to see what the next step should be.
Most flipped fish do FAR better with a medicated food, than with a water bourne antibiotic, so you need to get her eating, and it would be much better if you could get a hold of some medicated food.......
Please post back soon. We care........