Put in a small bowl and burn:
2 parts sage
1 part vervain
1 part rue
Think about and focus on the target and begin picturing them happy. Sense joy moving through them. Then focus on the words of this chant as you say them.
"To something good she will move
Leave my life, may she improve"
Do the spell a few different times during the week. The end result should be she finds something/someone new to obsess about and leaves your husband alone.
I used this spell after my divorce because my ex-wife kept trying to stay in touch with me. I wanted her to move on, so I cast this spell instead of cursing her. She is now happily married to a new guy and leaving me alone.