Your vet is incorrect about what a CL abscess feels like. They are hard knots on the lymph gland, they are unmovable, unlike a sticker or a shot site. They are not just marbles under the skin, but stuck to the deep tissue. The only soft spongy part of the abscess is the head when it is about to pop, they loose the skin, it turns red and bursts like a boil. Goats without abcess are contagious, first because with winter hair you are likely to miss the next abscess. Abscess in the lung is coughed all over her herdmates, and there are also abscess of the urinary tract and udder. When your vet removes this if you find the typical onion skin, peely texture right under the skin, and the cheesy material in the middle of the abscess, not much reason to waste your money on a test. The term cheesy gland is what CL used to be called, and that's exactly what the material looks like.
The very sad thing is if you purchased her a couple months ago, she likely caught this at the auction barn, the material from oozing abscess is contagious on wood surfaces for years. Really want her spreading this in your herd and in your barns? The first abscess does not have to be on a lymph gland site. Now if you just purchased her and she had this abscess quickly come up, why you should quranteen, than simply welcome to the world of auction barn goats
They are usually there because of communicable disease or mastitis.
Have it removed and test the abscess itself, send it to UC Davis only. Or if the vet can't remove it, some are so deep seated or around major artaries you can't have them removed, so have him aspirate it really well, and send in the material. Do not let her in your barn or areas where other goats will ever be, until she is completely healed and you have a negative test back. Read the CL information in the sticky above.
Lump?
YES< I use herbs on the animals 
