Oh how frustrating, Lorelie! I wish there was some magic way this could be changed. I can think of lots of ways while you are still weaving it but ……… Do you have a sample piece of the scarf? I’m a dyer and a friend, who also dyes, has used hair colour remover if she wants to remove colour from protein yarn. I have NO idea if this would work on cellulose yarn Or what the result would be, but it might be worth a try IF you have a sample to try it on.
Can you just call it a design element 😏, I’ll bet it won’t even be noticeable when it’s wrapped around her shoulders. What a lovely gift you have created, one that will wrap your daughter-in-law in love from you.