add to collar

I just finished knitting a jacket sweater for a toddler, had it lined and zipper put in when I noticed that I put the collar on wrong. Is there any way to correct this without removing the lining?

Welcome to the forum!
What is the name and designer of your pattern? It may help us if you can post a photo of the jacket and especially the collar area. Use the landscape icon in the middle of the top ribbon in the Reply box to start posting a photo.