All I have to go by is the photos and what you've written. It appears from the photo that you are blessed with Carolina thistle
which lead me to inquire about the spray. My concern is she would try to eat the blossoms off the thistles and ingest some
chemical in the process. She is still in the learning process about knowing what to eat so she may try anything at least once.
Otherwise I would separate her and insure she had at least a minimum of calcium , magnesium and zinc, heat and time
not withstanding. good luck
Also, to help her cells uptake the minerals, you could go to a health food store and get a small bottle of the Homeopathic Cell Salt called Calc. Phos. 6X or 30X. Give her one tablet every three hours or at least three times a day. Don't give 4 tablets at a time like it says on the bottle, that just wastes 3 tablets. Cell Salts are electrolytes that stimulate the cells to uptake the minerals the cells need to function properly. The cell stimulating effects run out in about 3 hours if it is Calc. Phos. 6X and in about 6 hours if it is 30X, so one tablet has to be given several times a day for best results. If Brandy has a neurological problem from pesticide exposure, the Calc. Phos. should help.
Since Covid hit two years ago, it has been difficult to find the 30X for some reason, but the stores still have the Calc. Phos. 6X or you can get it from one of the places on the internet that carry homeopathic products, like Luckyvitamins.com. I don't know if the Calc. Phos. will help Brandy. I never knew what it would help with until I gave it to an animal with a problem. I was totally amazed at what conditions it did help the animal recover from. For example, several years ago, I had an older quarter horse mare. When I went to feed her and my milk goats one morning in the spring, the mare was lying on her side and I couldn't get her to even try to get up. I gave her a Calc. Phos. tablet stuck in a slice of apple, which she ate even though she was lying on her side. I did my chores and about 45 minutes later went to see how my mare was doing. She was still lying down, but when I pulled on the halter I had put on her to try to get her up the first time, she got right up. I continued to give her the Calc. Phos. tablet in a slice of apple three times a day for a couple of weeks. She never had a problem getting up again and lived several more years. So, like I said, I only know what the Cell Salt electrolyte tablets will help with if I try them to see. Sometimes there was no observable effect on the condition.
I do know that when given to a newborn with contracted tendons in the front legs, the tendons loosened up and the youngster, whether deer fawn or domestic calf, could walk normally in about three days or less, but we had to try the Calc. Phos. on the youngsters to find that out. Also, as I already said on another post, when a newborn mammal or bird with an underbite was given the Calc. Phos. tablet at least three times a day, the underdeveloped facial bones grew to be normal in size in two days for hatchling birds and 13 days for mammal young, like horse foals, deer fawns, elk calves, beef calves and goat kids (also worked on human children with underbite or overbite according to the parents of those who tried it - saved them thousands in dental bills too). I only tried the Calc. Phos. on one newborn with an overbite, a goat kid, which is the only critter with an overbite I ever had to try it on because unlike in eastern U.S. there aren't many critters here in Montana born with an overbite. The goat kid's short lower jaw grew to normal length. All of the newborn mammals I tried it on had a normal bite in about two weeks. I will repeat, I had to give the Calc. Phos. tablet to animals with problems to find out what things they helped with! Naturopaths nor veterinarians had used Homeopathic Cell Salts to do any of the things I found they helped with by giving them. I hope that Brandy totally recovers and does not have permanent damage.