A.V.
Why wean totally? There are many levels of nursing, and with an older baby you may find that she's fine with a 7AM feeding, a bottle or sippy cup mid-day and nursing at night. For the last year, I nursed DD only at night before bed, so it was a very gradual tapering off. By 18 months, she was mostly nursing morning, after work and nighttime, but not always after work. I sent 6 oz for my work day and she often didn't drink them. She had a sippy of water (she did not like whole milk) for the rest of the day. I wouldn't supplement with formula unless you really think she needs it. I would give her whole milk or water in a sippy cup and see how she does. Hang in there and find the schedule that works for you. Nursing may be a way for you to feel connected to her while you are away and it can be a way to have a nice, cuddly reunion at the end of your day. OH, and if I had a day off or was home on the weekend, I nursed DD on demand and she seemed to understand it was different.