You will feel better if you tell her.
Why don't you print this out and give it to her?
It's fine, there are a lot of things to sort out in early sobriety, and this is just one of them. You're not going to do everything exactly perfectly all the time. No one does!
Honesty is for you, not for your sponsor. It's so you will have a clear conscience. Guilt and shame keep us locked in the addiction struggle.