Why do you say not to wash the top before having it quilted again... it would be just a soak in warm water... to close the needle marks... I am worried about the fabric colours running as she didn't wash the fabrics first...
Use cold water. Warm may set the colors depending on the type of markers. I use Pam Clarks sew clean. I use either a q-tip dipped it the sew clean or a begone pen filled with the liquid and it takes all marks out. Takes a while but I know the marks are gone forever.