Hi there and welcome
I'm sort of noticing 3 issues here:
1. Weaning from the breast.
2. Fussy solid food eater.
3. Night wakings.
For the latter 2, I'd suggest checking out the solids' board and the NW board for some ideas. As for the weaning, at a year old, there's no need for formula, and if she eats a balanced diet, then there's no need for cow's milk either. Although it sounds like she's not cooperating with a balanced diet! Does she drink other things than milk? Will she drink breastmilk if you pump or express? Does she like things like yogurt? My girls always enjoyed smoothies - a mix of yogurt, some fruit and maybe milk or juice as well. Does she like colourful straws to make it more fun? I also found that if I was drinking or eating something, it made it more interesting to my girls.
What's your daily routine like? Are you nursing her at any regular times during the day (or night)? It might be easier to drop some feeds if she's used to a routine and knows that she'll get some at regular times.
And finally, any thought of continuing to nurse just once or twice a day? I know I continued with morning and night feeds for months - until after 2 years. It can be very do-able even when working full time.