Great to hear of your wonderful baby, LM.....
Sounds as if you have not had good help with the bf. I would confirm what's already been said : carry on doing what you are doing and your milk will go.
Please ignore all the rubbish you have heard about foremilk and hindmilk. There is no way this can have a timer on it - and the hindmilk doesn't 'come through' in the way you are assuming. Fat in the milk is directly proportional to the amount of milk in the breast - a massively full breast will have milk that is proportionately higher in water compared to a breast with not much milk in it, which will be propotionately higher in fat. The milk gets creamier as the milk is removed, and the speed of this removal has nothing to do with the clock, and everything to do with the way your baby sucks and your own let down. Forget about the clock.
Search on my name and foremilk hindmilk in the mumsnet archives for more stuff about this if you are interested!
The only way you can retrieve this eminently retrievable situation is to start reducing/cutting out the formula as soon as you can, and feeding more often. You need to give your baby lots of skin to skin contact so she feeds more often, and doesn't cry to be fed.
You can certainly make enough milk for your baby with only one breast, but you would expect to be feeding very often to build up and maintain a supply...maybe feeding with very short gaps between feeds. Currently you are giving your baby maybe 14-16 oz in total of formula every day, yes? This is simply not compatible with maintaining a milk supply with a young baby, and your milk is dwindling as a result...much better you know this so you can take action.
Call any of the bf telephone lines and speak to someone about turning this situation around.
You deserve the very best help and support. What a shame the people whose job it is to offer this have been no use....