S.H.
My daughter self-weaned... at about 2.5 years old.
For both my kids, I did self-weaning.
And I was a co-sleeper too.
And "I" was the ONLY one that my kids would go to bed with/for.
For me, I explained to my girl that she is a big girl and one day she won't have to nurse etc.
If she wanted to nurse, I would sometimes tell her "In a minute, Mommy is busy..." and I would make myself 'busy' and then she would get distracted and/or forget about it.
My friends, whose child was also still nursing at that age, simply put Band-Aids over their nipples and said "Mommy has an owie..." or, "Mommy's milk doesn't work anymore..." and they said this worked well for them and the child didn't anguish about it.
Your child, does not nurse a lot. Only once at bedtime. So, it will vanish one day. Give her a lovey to sleep with. Or something else to comfort with. Or your T-shirt etc.
My daughter, just one day told me "I don't drink from you anymore..." and then she giggled like she thought it was so silly. And that was it. No more did she nurse.
all the best,
Susan