K.
I'm so sorry you have to wean her and are having trouble! I don't have any direct experience with this (my 14 month old still breastfeeds) but I would see if you can get her to drink formula or breast milk from a sippy cup - which may be different enough from a bottle that she'll do it. Also, have someone else give her a bottle (not you - why would she take a bottle when she knows that the breast is available?) while you're out. You can try gradually mixing formula and EBM to get her used to the taste. If she's losing weight you can increase the amount of solids she's getting at this age. Especially if she's not taking much milk. If you mix EBM or formula with cereal, that will be another way to get more into her (assuming she'll eat it). You can also mix it with mashed potatoes. She may take in more calories if it's "interesting". My son is really skinny (runs about 10th percentile for weight) and we put butter on his veggies, feed him whole milk yogurt, peanut butter (once he turned 12 months) etc - lots of good high calorie food - he's still skinny but gains steadily.