When you squeeze your nipples, "nothing" comes out?
Also, yes, at this point, you will not have that "full" feeling in your breasts... with extended breastfeeding... the child is now "nursing" less frequently... so the body naturally adjusts to that.
Your daughter is now 2 years old... she can certainly "tell" you if milk is still coming out.. .just ask her. That's what I did with my girl.
Also, her morning diaper is probably "dry" because at this age... they are of potty training age, and they can go longer before pee'ing and they will naturally have more dry diapers upon waking.
I too did extended breastfeeding....until my girl self-weaned at about 2 to 2.5 years old. Maybe your girl will just stop on her own. Mine did. By this time, I still had milk coming out.. but it doesn't matter how much, since by this age it is not primarily for nutrition anymore and is just comfort & bonding, and they do not "nurse" as frequently or as long anymore by this stage. But, I did not have the "fullness" feeling either in my breasts by this time... the body just changes and adjusts.
Don't worry about how much milk is there or not. Really. Hopefully, it will help in weaning your daughter, if this is the route you want. Also, just explaining things to her is good, age appropriately of course. That's what I did with my girl to "egg her on" and I was glad she self-weaned. I did not force it... just one day she thought it was "silly" she was still doing it, and stopped and said she's "a big girl now." I was glad.
If you truly want to wean her... you need to shorten the time she is at your breast... and the frequency and duration. Otherwise, she may not be able to go to sleep on her own.... for example, maybe there is no milk.. but she is just at your breast for comfort & sleep.... then at this point it is no longer "breastfeeding"... and just a habit they do to sleep. For my girl, this was the case as well.
I never regretted extended breastfeeding...and my Hubby also supported it and me in doing it. In fact many child experts encourage it. In our culture... the emphasis is always on "weaning" quickly and emphasizing how children/babies should NOT get "attached" to anything and un-attaching children as quickly as possible from the Parent. ie: no pacifiers, no breastfeeding beyond 1 year old, no co-sleeping, no getting attached to "lovies", crying it out to sleep, sleeping on their own, etc. Other cultures nurse for longer and nurture bonding.
But, everyone is different.
Well, just my situation and what I experienced.
All the best,
~Susan