Sounds like you are really struggling with the whole thing mentally. You have done a fantastic job. Your feeding journey hasn't been easy and you have done very well in adverse circumstances.
In an ideal world you'd continue BF'ing, but it's not working out that way and there isn't a lot you can do about it. So don't be too hard on yourself.

Our babes are one next month. Even though BF is still an important part of the diet, as they approach 12 months solid food starts to take over as the main source of nutrition. Have you thought about trying different foods and encouraging her with solids a bit more rather than introducing a milk? Cows milk and goats milk don't have the same nutrients that BM do and they are not really a substitute, if it were me, i would rather try and increase the variety of food at that age. I continued offering DD1 BM when i was pregnant with DD2, like you my supply dropped and BF'ing was not enjoyable at all, i almost dreaded it. In the end she weaned when i was about 7 months i think, i was sad out BF'ing was cut short, but that was the best thing for both of us at the time.

One last idea, are you offering food before BM yet? she might be a bit keener if she's hungry?

Good luck!