Please help, cats are constantly fighting after a trip to the vet?

My older cat, Miley, and my younger cat, Tabby, have been hissing at each other and fighting ever since Miley came back from the vet. Miley just wants to be left alone, because it was hard getting her to the vet to begin with (she wasn't hurt or anything, but following her around with a cage was tough). Everyone in the house can get along fine with Miley again, except Tabby, who Miley hisses and growls at every time she walks up near her. She didn't do this previously. And Tabby, who never hisses at all, started hissing and growling at Miley recently. Tabby's always the one to start the fight. She always tackles Miley and they screech and fight with each other for a few seconds. It's really hard to watch. Miley's declawed while Tabby isn't. I don't want to see Miley get hurt, but I don't want to make the same mistake we had with Miley and declaw Tabby. I just want them to get along again and I have no idea how to do that. Miley's been really different since the vet. She's always anti-social, but now she's hiding in areas and tries everything she can to not have any communication with Tabby. Please help if possible.