The nitrogen in the urine is burning the grass, same thing would happen if you peed on it. It will grow back.
I assume this is the backyard? You could keep a watering can handy and water the urine in after she pees to dilute it. If you let her in/out you could also take her out on a leash and teach/reward her when she pees on the leash in a grass free area (give her a treat/praise and let her off lead immediately after). If you do it that way try to pick an area not far from the door so she will use it in inclimate weather too.
How big of a dog is this? Is she primarily indoors?
This is not going to be a one shot solution. Lets make the diagnosis right first. I am confident that lawn is not getting burnt because of dog pee (or excessive nitrogen), but there is lack of some factors to balance the impact. Those factors might be those that make a lawn healthy (things that can make unhealthy such as: lack of soil creatures -worms, bacteria, fungus or many many others, mono culture of 1-5/6 different grass types, low levels of soil carbon ratio, low levels of unbroken organic matter, lack of drainage (for clay) or very limited watering), or you might have too many animals in a small area. So, try to make your lawn healthy and as diverse as possible. Leave you lawn clippings on the spot, dry grass will buffer the impact and will create a mulch layer. Higher levels of soil carbon ratio helps a lot but you will also need unbroken organic matter (think about mob grazing). Let weeds grow! Every plant has different needs and also tolerances. It won't happen just in one year, but it will get better and better. Like 4 years, I guess -didn't take notes, after I implemented the recommendations given on this site (and rich soil also), classic lawns problems were gone. No need to mow every other week, no need to water (maybe once in a month for our Mediterranean summers), no burns, no compaction, and not many weeds (cut them high).
In meantime, you can water the spot well (as you do when you burn by your lawn with excessive nitrogen by chemical fertilizers), throw some seeds and drop some smaller sized wood chips (or some shredded brown leaves) or compost.
I see you responded to a similar thread, how that worked out for you? Brown pee spots
I think just watering the urine in might work in a lot of cases.
I think that if leaf litter is ever available, I would bag some up for distribution across the lawn every time I mow. I would then scatter leaves all over the lawn before mowing, and I would use either a reel mower or a mulching mower, and then rake the chopped leaves and grass clippings into the lawn.
I would also be leaving the lawn a little longer, and making sure that I was watering deeply and not too often. If I was adventurous, I would delve into the world of compost extracts and fungal slurries, brew up some oxygenated extracts and apply them to the lawn.
And I'd seed the lawn with some tiny clovers to add diversity without complicating the look and feel of the lawn.
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein
I've had success reseeding the spots and covering with mushroom manure. Which says to me the problem is the salt in the urine. Otherwise the nitrogen in the mushroom manure would make the problem worse.
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