It must he really hard to be surrounded by people who love you & your daughter but don't appreciate what you are doing for her. Have you ever shared information with them about the benefits of breastfeeding a toddler?
I can imagine that it makes any decision you make that much harder, because you're wanting to do the right thing but also please people who are important to you.
You sound pretty sure about wanting to nightwean her at least. Have you read Dr Jay Gordon's nightweaning advice for co sleeping toddlers? http://http://drjaygordon.com/attachment/sleeppattern.html
It takes time and effort to nightwean an attached baby. Perseverance, mostly. I'd be happy to share my experience, if you have more questions about nwing.
Re the weekend, plenty of breastfed toddlers spend time away from their mothers at this age and are not weaned. It's not a requirement.