Or her immobility could be a water quality issue. It might especially be a matter of available oxygen and/or nitrogen/nitrate poisoning.
What is the tank's temperature? What has been the pattern of partial water changes? How often and how much are you changing?
(While figuring this out, if you have some treated water which is the same temperature as the tank, please do a 25% partial water change. Vacuum obvious dirt off ofthe tank bottom. If the water is seasoned, so much the better.)
Iss there any uneaten food rotting in the tank, That adds huge amounts of nitrogen based waste materials and sucks all sorts of oxygen out of the tank. Are you doing a little gravel vacuuming every week or so? You probably woulsn't do the whole tank, but over a month you probably would get the bottom on a weekly installment basis.
How long has the aquarium been set up? By week 6 or 8 were your tests for ammonia and nitrite at zero? Were nitrates below 40 PPM or better, below 20 PPM?
If you have an air stone only on your aquarium, can you turn it up a little, without sweeping the fish around the tank?
If you have a power or box filter, is the filter box full of gunk? Can you lightly rinse most of that out, while leaving the filter floss gray? (That way all of the beneficial bacteria is not washed out.)
If you have some activated carbon, you might rinse some out and put it into a bag and in the filter box for the emergency. Any resin type of thing which absorbs ammonia will be expensive, but may be useful in the emergency.
Oh! How old is peaches?
Please do what you can here and then, when convenient, answer what you can.
Thanks and good luck!