Sometimes it is just better to go ahead and finish the quilting, then wash the whole thing and let it bleed. So, the beige background ends up a light pink. Just call it a design choice and don't sweat the small stuff.
But, if it bothers you, there was a bleach pen out there years ago, that might help with the bleeding. Or pour some of the bleach spray cleaner in a bowl and use a q-tip to barely touch the bleach mixture to the fabric. I have taken bleeding out by doing that. The bleach will evaporate so it doesn't need to be washed. Good luck with the blue. The bleach water might work. I'd ask Mr. Google about that.