Like the end of your fingernail, anything that is beyound the quick of the hoof can be trimmed. If it were me, I might try to remove excess growth in two trimming just to allow them to adjust bewteen- do a big one then wait a few days and start cutting back to the living hoof.
I didn't know how, we bought them worse than that....the foot in the picture (which is Dottie's hind right...lol) was a good two inches longer than that. I finally decided to just do it, and hope I figure it out...but I need some better clippers, i am using kitchen scissors now, and they hooves are so bad they aren't doing a thing....
You can trim off that long toe close to where the other one is. If you don't have foot shears, you can use garden hand pruners to get the most off.
It will be easier to clip if the foot is not really dried out. Good for you to check it out- she'll be happier for it.
gardening pruning shears would work better than scissors if you have any. Without seeing it from the underside I too would guess that you could shorten the one to the legnth of the other. When I brought Bucky home last fall his feet where much worse, (that was just the way he came!!!). If your goats go outside when it is damp. ie. morning dew, after a rain storm. The moisture will help soften the feet and make them cut a little easier.