Losing muscle

[Howlin Mad Missy]

I was lifting weights not to long ago before i started boxin.(been in it for 1 month now aside from two years ago havin boxed 1 1/2 years)
I have fat and Also muscle lots of muscle losiong fat i seem to be doin godo but i am at 157 lbs. and plan to end up at 130 i am 5'3"-5'4". I assume im not goin to drop27 lbs on fat only so id figure ill have to drop muscle while gaining it during training.
My question is whats a good way to lose muscle?

If you're doing good, stick at it and watch your body change.

Eat less or exercise more - your body will begin to eat muscle for fuel.
If you overexercise a muscle it doesn't get time to rest and grow (also increase chance of injury). Look at the body of a sprinter compared to a long distance runner.

All this is highly oversimplified.

But I'd still say stick with what you're doing and try and eat clean.